2018 GMC Terrain Catalytic Converters

Please Select your Vehicle to See Exact Fit Parts

Keep Your 2018 GMC Terrain in Top Shape with Quality Catalytic Converters

Whether you’re repairing or upgrading your Catalytic Converter, using high-quality parts is key to keeping your 2018 GMC Terrain looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Catalytic Converters. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Explore Related Parts

While you’re upgrading or replacing your Catalytic Converter, don’t forget to check out other key components like Exhaust Manifold and Headers and Exhaust System Kits. At Advance Auto Parts, we’re here to help you keep your 2018 GMC Terrain in peak condition, inside and out.

Essential 2018 GMC Terrain Catalytic Converters

MagnaFlow – California Grade Carb Compliant Universal Catalytic Converter (Part No.5592306)

California Grade Carb Compliant Universal Catalytic Converter

from

$1129.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 5592306. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.

Product Features:
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Universal Catalytic Converter (Part No.51206)

Oem Grade Federal / Epa Compliant Universal Catalytic Converter

from

$211.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51206. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.

Product Features:
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter (Part No.52186)

Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter

from

$741.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52186. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 52186 includes (5) Nuts, (6) Bolts, (6) Flat Washers, (1) O2 Port Plug, (1) Flange Gasket, (1) Crush Ring Gasket and interchanges with OE parts 25970315. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

Dorman – Pre-Converter – CARB Compliant (Part No.678-527)

Pre-Converter - CARB Compliant

from

$1884.00
Pre-Converter – CARB Compliant

Walker – Ultra EPA Direct Fit Catalytic Converter 2.74" Outlet (OD) (Part No.16796)

Ultra EPA Direct Fit Catalytic Converter 2.74" Outlet (OD)

from

$631.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.

Product Features:
  • EPA COMPLIANT — For use on OBDII vehicles, 1996 and newer. Not legal for sale or use in CA, CO & NY. Legal in ME on EPA Federal Emission Equipped Vehicles only. Consult your state’s aftermarket converter regulations for details.
  • DIRECT-FIT DESIGN — Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn’t require specialized fabrication and/or welding
  • KEEPS CHECK ENGINE LIGHT OFF FOR EMISSIONS CODES — OE-style high-technology washcoat and optimal precious metal load delivers required reduction in tailpipe emissions to match vehicle application
  • STRONG AND DURABLE — Features thick OE-style flanges, hangers and brackets for strength and durability
  • OE-STYLE DESIGN — Features aluminized heat shields when originally equipped, to match OE design, protecting the undercarriage from heat created by the converter
  • BUY WITH CONFIDENCE — Backed by Walker’s 25,000-mile/40,000-kilometer emissions and 5-year 50,000-mile/80,000-kilometer structural integrity warranty. Visit Walkerexhaust.com for details.
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter (Part No.52103)

Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter

from

$497.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52103. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 52103 includes (1) Torca Clamp, (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter (Part No.52230)

Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter

from

$965.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Manifold Catalytic Converter 52230. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This Direct-Fit Manifold Catalytic Converter is designed to fit the 2010-2011 Chevrolet Equinox 3.0L & 2010-2011 GMC Terrain 3.0L. MagnaFlow 52230 includes (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
See More

Walker – Ultra EPA Direct Fit Catalytic Converter 2.25" Outlet (ID) (Part No.54850)

Ultra EPA Direct Fit Catalytic Converter 2.25" Outlet (ID)

from

$439.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.

Product Features:
  • EPA COMPLIANT — For use on OBDII vehicles, 1996 and newer. Not legal for sale or use in CA, CO & NY. Legal in ME on EPA Federal Emission Equipped Vehicles only. Consult your state’s aftermarket converter regulations for details.
  • DIRECT-FIT DESIGN — Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn’t require specialized fabrication and/or welding
  • KEEPS CHECK ENGINE LIGHT OFF FOR EMISSIONS CODES — OE-style high-technology washcoat and optimal precious metal load delivers required reduction in tailpipe emissions to match vehicle application
  • STRONG AND DURABLE — Features thick OE-style flanges, hangers and brackets for strength and durability
  • OE-STYLE DESIGN — Features aluminized heat shields when originally equipped, to match OE design, protecting the undercarriage from heat created by the converter
  • BUY WITH CONFIDENCE — Backed by Walker’s 25,000-mile/40,000-kilometer emissions and 5-year 50,000-mile/80,000-kilometer structural integrity warranty. Visit Walkerexhaust.com for details.
See More

MagnaFlow – California Grade Carb Compliant Direct-Fit Catalytic Converter (Part No.5592103)

California Grade Carb Compliant Direct-Fit Catalytic Converter

from

$1264.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5592103. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 5592103 includes (1) Torca Clamp, (1) Flange Gasket. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for CARB-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter (Part No.52188)

Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter

from

$993.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Manifold Catalytic Converter 52188. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 52188 includes (2) Nuts, (2) Bolts, (2) Flat Washers, (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter (Part No.21-421)

Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter

from

$988.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 21-421. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 21-421 includes (6) Bolts, (1) Flange Gasket, (2) Split Lock Washers and interchanges with OE parts 12667331. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

Dorman – Pre-Converter – Not CARB Compliant (Part No.679-755)

Pre-Converter - Not CARB Compliant

from

$899.99
This catalytic converter is precision-engineered to match the original equipment fit and function on specific vehicle years, makes and models for a reliable replacement.

Product Features:
  • Direct replacement – this catalytic converter is designed to match the fit and performance of the original equipment on specific vehicles
  • Durable construction – manufactured within strict tolerances for reliable longevity
  • Cost-effective solution – offers original equipment functionality at a competitive price
  • Trustworthy value – backed by team of engineers and quality control experts in the United States
See More

Walker – Ultra EPA Direct Fit Catalytic Converter, 2.74" Outlet (OD) (Part No.16581)

Ultra EPA Direct Fit Catalytic Converter, 2.74" Outlet (OD)

from

$899.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra Direct-Fit Catalytic Converters provide premium performance and are available for import and domestic OBDII (1996 and newer) vehicles.

Product Features:
  • EPA COMPLIANT : For use on OBDII vehicles, 1996 and newer. Not legal for sale or use in CA, CO & NY. Legal in ME on EPA Federal Emission Equipped Vehicles only. Consult your state’s aftermarket converter regulations for details.
  • DIRECT-FIT DESIGN : Direct-fit bolt-on replacement solution with OE-style hangers, brackets, routings and heat shields for easy installation that doesn’t require specialized fabrication and/or welding
  • KEEPS CHECK ENGINE LIGHT OFF FOR EMISSIONS CODES : OE-style high-technology wash coat and optimal precious metal load delivers required reduction in tailpipe emissions to match vehicle application
  • STRONG AND DURABLE : Features thick OE-style flanges, hangers and brackets for strength and durability
  • OE-STYLE DESIGN : Features aluminized heat shields when originally equipped, to match OE design, protecting the undercarriage from heat created by the converter
See More

Walker – Ultra EPA Direct Fit Catalytic Converter Overall Length 14.030 IN (Part No.16882)

Ultra EPA Direct Fit Catalytic Converter Overall Length 14.030 IN

from

$799.99
Designed to comply with EPA standards while delivering premium performance with assured compliance, Walker Ultra direct-fit catalytic converters are available for import and domestic OBDII (1996 and newer) vehicles. Count on Walker Ultra converters for industry-leading fit and function.

Product Features:
See More

MagnaFlow – California Grade Carb Compliant Direct-Fit Catalytic Converter (Part No.5592804)

California Grade Carb Compliant Direct-Fit Catalytic Converter

from

$1372.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5592804. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 5592804 includes (1) Flange Gasket. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for CARB-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

MagnaFlow – California Grade Carb Compliant Direct-Fit Catalytic Converter (Part No.5582941)

California Grade Carb Compliant Direct-Fit Catalytic Converter

from

$2077.00
Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5582941. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 5582941 includes (5) Nuts, (6) Bolts, (6) Flat Washers, (1) O2 Port Plug, (1) Flange Gasket, (1) Crush Ring Gasket and interchanges with OE parts 25970315. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for CARB-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter (Part No.51804)

Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter

from

$478.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51804. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 51804 includes (1) Flange Gasket and interchanges with OE parts 25970320. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
See More

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter (Part No.52189)

Oem Grade Federal / Epa Compliant Direct-Fit Manifold Catalytic Converter

from

$851.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Manifold Catalytic Converter 52189. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 52189 includes (2) Nuts, (2) Bolts, (2) Flat Washers, (1) Flange Gasket. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

Dorman – Direct Fit Catalytic Converter: No Fabrication Needed, EPA Compliant (Part No.679-527)

Direct Fit Catalytic Converter: No Fabrication Needed, EPA Compliant

from

$729.99
This catalytic converter is precision-engineered to match the original equipment fit and function on specific vehicle years, makes and models for a reliable replacement.

Product Features:
  • Direct replacement – this catalytic converter is designed to match the fit and performance of the original equipment on specific vehicles
  • Durable construction – manufactured within strict tolerances for reliable longevity
  • Cost-effective solution – offers original equipment functionality at a competitive price
  • Trustworthy value – backed by team of engineers and quality control experts in the United States
See More

Most Popular Catalytic Converters for 2018 GMC Terrains

Enhance your 2018 GMC Terrain with one of the 2 Catalytic Converters we have in stock, starting at just $899.99.

MagnaFlow – Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter (Part No.21-421)

Oem Grade Federal / Epa Compliant Direct-Fit Catalytic Converter

from

$988.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 21-421. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this converter yourself using the proper tools, no cutting or welding required. MagnaFlow’s state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. MagnaFlow 21-421 includes (6) Bolts, (1) Flange Gasket, (2) Split Lock Washers and interchanges with OE parts 12667331. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.

Product Features:
  • Durable 308 stainless steel MIG welds
  • Simplifies installation with essential gaskets and hardware being included in the box
  • Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel, designed to reduce noise and vibration
  • Mandrel bent tubing retains OEM-like design and geometry, ensuring smooth exhaust flow for peak fuel economy and engine operation
  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
See More

Dorman – Pre-Converter – Not CARB Compliant (Part No.679-755)

Pre-Converter - Not CARB Compliant

from

$899.99
This catalytic converter is precision-engineered to match the original equipment fit and function on specific vehicle years, makes and models for a reliable replacement.

Product Features:
  • Direct replacement – this catalytic converter is designed to match the fit and performance of the original equipment on specific vehicles
  • Durable construction – manufactured within strict tolerances for reliable longevity
  • Cost-effective solution – offers original equipment functionality at a competitive price
  • Trustworthy value – backed by team of engineers and quality control experts in the United States
See More

FAQs for 2018 GMC Terrain Catalytic Converters

What are the best-selling Catalytic Converters for 2018 GMC Terrains?

Out of 2 Catalytic Converters that fit 2018 GMC Terrains, the following parts are the top sellers:

What’s the price range for 2018 GMC Terrain Catalytic Converters?

The prices of Catalytic Converters for the 2018 GMC Terrain range from $899.99 up to $988.99 for the most premium parts.

What is the average price of a Catalytic Converter for a 2018 GMC Terrain?

The average price for Catalytic Converters for the 2018 GMC Terrain is $944.49. Keep in mind the variety of part types within our Catalytic Converter category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Catalytic Converters for other GMC Terrain model years?

Yes, we carry Catalytic Converters for 12 model years of GMC Terrains between 2010 and 2023. The following model years are the most popular for Catalytic Converter purchases: 2020, 2019, 2017, 2016, 2015, 2014, 2013, 2012, and 2011.

What are the cheapest Catalytic Converters for my 2018 GMC Terrain?

The cheapest 2018 GMC Terrain Catalytic Converters we carry are:

Does Advance Auto Parts sell Catalytic Converters for any other 2018 GMC models?

What types of Catalytic Converters do you sell for my 2018 GMC Terrain?

We currently have just 1 Catalytic Converter in stock for a 2018 GMC Terrain, and as of 6/2/26, it is a Catalytic Converter.

Can I get help with 2018 GMC Terrain Catalytic Converter orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about GMC Catalytic Converters and more.

What is your return policy for GMC Terrain Catalytic Converters?

Advance Auto Parts keeps returns simple. For new GMC Terrain Catalytic Converters and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.