2003 Infiniti M45 Catalytic Converters
Keep Your 2003 Infiniti M45 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 2003 Infiniti M45 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.
Top-Rated Catalytic Converters from Trusted Brands
Looking for a reliable Catalytic Converter? We’ve got you covered with options from brands you know and trust like Dorman. For example, Dorman Catalytic Converters start at just $1,132.99 with an average 4.2 star rating. With over 10 reviews and a solid 5 star average, you can shop with confidence knowing other Infiniti M45 owners approve.
Competitive Prices and Extensive Inventory
The average price for a 2003 Infiniti M45 Catalytic Converter at Advance Auto Parts is around $876.99, with a range that starts at $620.99 and goes up to $1,132.99. With 2 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold start at just $620.99 and offer a great balance of form and function.
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 2003 Infiniti M45 in peak condition, inside and out.
Find Your Specific 2003 Infiniti M45 Catalytic Converters
Looking for the perfect Catalytic Converter for your 2003 Infiniti M45? You’re in the right place. Below, you’ll find links to various types of Catalytic Converters that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Catalytic Converters, ensuring durability and a precise fit for your Infiniti M45. Whether you’re driving a 2003 model or another popular model year like
2004, we’ve got you covered. Purchasing Catalytic Converters from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Catalytic Converters that fit your vehicle.
Essential 2003 Infiniti M45 Catalytic Converters
Dorman – Manifold Converter – CARB Compliant (Part No.673-650)
from
$1132.99
This catalytic converter with integrated exhaust manifold – a.k.a. manifold converter – is precision-engineered to match the original equipment on specific vehicle years, makes and models for a reliable replacement.
Product Features:
See More
Product Features:
- Direct replacement – this manifold converter is designed to match the fit and performance of the original equipment on specific vehicles
- Convenient kit – includes gaskets and downpipe hardware to simplify installation
- Durable construction -manufactured within strict tolerances for reliable longevity
- Trustworthy value – backed by team of engineers and quality control experts in the United States
MagnaFlow – Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold (Part No.52424)
from
$620.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52424. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this spun” Body 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 spun” Body 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. Designed to fit the 2003-2004 INFINITI M45 and 2003-2006 INFINITI Q45, this direct-fit catalytic converter also interchanges with OE parts 14002-CR90A and 14002-CR900. Avoid potential exhaust leaks by using the included gaskets to get a proper seal. 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
Product Features:
- Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
- High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
- Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
- Simplifies installation with essential gaskets and hardware being included in the box
- Durable 308 stainless steel MIG welds
Popular 2003 Infiniti M45 Catalytic Converters Categories
Most Popular Catalytic Converters for 2003 Infiniti M45s
Enhance your 2003 Infiniti M45 with one of the 2 Catalytic Converters we have in stock, starting at just $620.99.
Dorman – Manifold Converter – CARB Compliant (Part No.673-650)
from
$1132.99
This catalytic converter with integrated exhaust manifold – a.k.a. manifold converter – is precision-engineered to match the original equipment on specific vehicle years, makes and models for a reliable replacement.
Product Features:
See More
Product Features:
- Direct replacement – this manifold converter is designed to match the fit and performance of the original equipment on specific vehicles
- Convenient kit – includes gaskets and downpipe hardware to simplify installation
- Durable construction -manufactured within strict tolerances for reliable longevity
- Trustworthy value – backed by team of engineers and quality control experts in the United States
MagnaFlow – Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold (Part No.52424)
from
$620.99
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 52424. With features including free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction, easily install this spun” Body 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 spun” Body 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. Designed to fit the 2003-2004 INFINITI M45 and 2003-2006 INFINITI Q45, this direct-fit catalytic converter also interchanges with OE parts 14002-CR90A and 14002-CR900. Avoid potential exhaust leaks by using the included gaskets to get a proper seal. 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
Product Features:
- Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
- High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
- Expertly crafted to replicate OEM-like flow dynamics, maintaining factory performance and fuel efficiency
- Simplifies installation with essential gaskets and hardware being included in the box
- Durable 308 stainless steel MIG welds
Top-Rated Catalytic Converter Brands For Your 2003 Infiniti M45
When it comes to finding the perfect Catalytic Converter for your 2003 Infiniti M45, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 2 trusted brands. We carry the most popular Catalytic Converter brands including Dorman, and more, all known for their exceptional customer ratings (average brand rating of 4.2 stars) and competitive prices, as low as $1,132.99. Purchasing a Catalytic Converter from us here at Advance Auto Parts is a smart move for both you and your 2003 Infiniti M45, providing peace of mind with parts that meet or exceed OEM standards.
Popular Dorman 2003 Infiniti M45 Catalytic Converters
If you’re looking for a top-quality Catalytic Converter for your 2003 Infiniti M45, Advance Auto Parts has exactly what you need with our selection of Dorman Catalytic Converters. We have 1 Dorman Catalytic Converters in stock for this fitment, all known for their durability and precision fit. With prices starting at just $1,132.99, you’ll find the perfect Catalytic Converter for your needs and budget. Dorman Catalytic Converters for the 2003 Infiniti M45 come highly rated, with over 10 customer reviews and an impressive average rating of 4.2 stars. Choosing a Dorman Catalytic Converter from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
FAQs for 2003 Infiniti M45 Catalytic Converters
What are the best-selling Catalytic Converters for 2003 Infiniti M45s?
Out of 2 Catalytic Converters that fit 2003 Infiniti M45s, the following parts are the top sellers:
- Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold (11764621) – $620.99
What’s the price range for 2003 Infiniti M45 Catalytic Converters?
The prices of Catalytic Converters for the 2003 Infiniti M45 range from $620.99 up to $1,132.99 for the most premium parts.
What is the average price of a Catalytic Converter for a 2003 Infiniti M45?
The average price for Catalytic Converters for the 2003 Infiniti M45 is $876.99. 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.
What are the cheapest Catalytic Converters for my 2003 Infiniti M45?
The cheapest 2003 Infiniti M45 Catalytic Converters we carry are:
- Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold (11764621) – $620.99
- Manifold Converter – CARB Compliant (50201673) – $1,132.99
Does Advance Auto Parts sell Catalytic Converters for any other 2003 Infiniti models?
Yes. We stock Catalytic Converters for 4 other popular 2003 Infiniti models. Some of the most popular are 2003 G35 Catalytic Converters, 2003 FX35 Catalytic Converters, 2003 I35 Catalytic Converters, 2003 QX4 Catalytic Converters, and 2003 Q45 Catalytic Converters.
What are the top-rated Catalytic Converters that fit the 2003 Infiniti M45?
The one 2003 Infiniti M45 Catalytic Converter we have in stock is the Direct-Fit OEM Grade Catalytic Converter with Integrated Exhaust Manifold. It costs $620.99.
What types of Catalytic Converters do you sell for my 2003 Infiniti M45?
We currently have just 1 Catalytic Converter in stock for a 2003 Infiniti M45, and as of 11/2/25, it is a Catalytic Converter.
Can I get help with 2003 Infiniti M45 Catalytic Converter orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Infiniti Catalytic Converters and more.
What is your return policy for Infiniti M45 Catalytic Converters?
Advance Auto Parts keeps returns simple. For new Infiniti M45 Catalytic Converters and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.