2012 GMC Sierra 3500 HD Exhaust Parts

Interested in a new exhaust system for your LML Duramax? Check out the Large Bore-HD DPF-Back exhaust system by aFe. This system is constructed from 5″ mandrel-bent 409 stainless steel tubing and uses high quality band clamps and OE-style bayonet hangers. This unit uses all factory mounting locations to provide a quick, hassle-free installation. Also included in this exhaust system is a massive 6″ wrinkle-black powder-coated 304 stainless steel tip with a laser-cut stainless steel aFe power badge. Large Bore-HD exhaust systems are the perfect combination of performance, fit and value. Simple Installation: All systems use factory mounting locations providing stability and hassle-free installation. Leak-Free Seal: High quality band clamps are included for a complete 360 degree sealing surface. OE Fit: OE-style bayonet hangers are used to maintain a stable pipe location during high vibration and high heat conditions. The bayonet tip holds the hanger bushing in place for an OE-style fit that does not change with time. Flow and Performance: This Large Bore-HD exhaust system is constructed of 5″ mandrel-bent stainless steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGT’s. 6″ Diameter Polished Intercooled Tip: Finishing off the exhaust is a 6″ diameter, high luster polished, stainless steel slash cut tip with intercooling vents designed to reduce exhaust gas temperatures at the tailpipe. A unique stainless steel laser-cut aFe Power logo plate is riveted on for an aggressive style.

Product Features:

• Mandrel Bent Tubing For Maximum Flow
• Hassle Free Installation
• High Quality Band Clamps For Leak-Free Seal
• Smooth Transition Bends Allows For Low Turbulence

Exhaust Clamp

Exhaust Seal Ring

Complete your exhaust repair with Walker® insulators. Available in a variety of styles and sizes, they’re designed to work with Walker aftermarket replacement parts for quick and easy installation.

Product Features:

• OE DESIGN — Designed with OE-style features for easy installation and fit
• PREMIUM MATERIALS — Made from high-quality materials for durability and long life
• AVAILABLE IN DIFFERENT SIZES — Offered in a variety of styles and sizes for a quality vehicle repair
• KEEPS EXHAUST PARTS IN PLACE — Designed to support undercar exhaust components
• BETTER TOGETHER — Use premium Walker accessories when installing Walker catalytic converters and mufflers for a complete exhaust system upgrade

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

• Meets or exceeds all original equipment specifications
• Application specific design to ensure a perfect fit
• Engineered for the sealing repair environment
• Unsurpassed quality you can trust
• Validated for fit, form, and function

Made from quality materials for durability, DynoMax® pipe is manufactured with precision benders and fixture checked to ensure a precise fit for quick and easy installation.

Product Features:

• IMPROVED FLOW CAPACITY — Mandrel bends (where applicable) improve flow capacity over traditional bends while increased pipe diameter from OE sizes increases flow and power
• DESIGNED TO PERFORM — Fixture checked to ensure a precise fit for quick and easy installation
• AVAILABLE IN DIFFERENT SIZES — Offered in a variety of styles and sizes for a quality vehicle repair
• PREMIUM MATERIALS – Made from stainless steel for durability and long life
• BETTER TOGETHER — Use premium DynoMax® accessories when installing DynoMax mufflers and exhaust systems for a complete performance exhaust system upgrade

Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5451644. 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. This direct-fit catalytic converter is designed to fit the 2007-2010 Chevrolet Silverado 2500 HD, 2007-2010 GMC Sierra 2500 HD, and additional vehicles. The included gaskets & hardware reduce the possibility of a leaking seal while avoiding the need to reuse corroded factory parts for installation. 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:

• 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.
• Your trusted source for CARB-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last.

Designed, tested and validated for assured compliance to meet CARB standards, Walker® CalCat® Universal Catalytic Converters are available for OBDII (1996 and newer) and non-OBD (1995 and older) vehicles.

Product Features:

• CARB COMPLIANT — For use on OBDII vehicles, 1996 and newer and non-OBD 1995 and older. Legal for sale in CA, CO, NY & other states requiring CARB-compliant replacement converters. Consult your state’s aftermarket converter regulations.
• SUPERIOR TECHNOLOGY — Optimal high technology washcoat formulated to deliver superior performance (as compared to EPA-compliant converters)
• CONSISTENT PERFORMANCE — Utilizes a precise OE-style coating process to apply catalyst material to the substrate, providing consistent performance for assured emissions compliance
• DURABLE — Features stainless-steel body with aluminized pipe and heat shields for durability
• FLEXIBLE SOLUTION — Customizable design features expandable bushings for easy fitment and may require specialized fabrication and/or welding for installation
• BUY WITH CONFIDENCE — Backed by Walker’s 50,000-mile/80,000-kilometer emissions and structural integrity warranty

This exhaust gas temperature (EGT) sensor bung repair kit is designed to match the original components required to repair the sensor bung on specified vehicles. Made of quality components, this kit is engineered for reliable performance and durability.

Product Features:

• Cost-effective fix – this EGT sensor bung repair kit allows direct replacement of only a failed bung, rather than an entire exhaust pipe
• Weld-on plate – bung comes with steel plate for repairing pipe if damaged during bung removal
• Application specific – designed for a wide range of vehicle years, makes and models
• This part has undergone vehicle try-on testing for conformance to product standards and quality

Exhaust Manifold Gas

GM Genuine Parts Exhaust Manifold Gaskets are designed, engineered, and tested to rigorous standards, and are backed by General Motors. They help form a gas-tight connection between the exhaust manifold and cylinder heads. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Product Features:

• Helps prevent exhaust leaks
• Helps provide a tight seal where the exhaust manifold mounts to the engine block
• Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
• GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
• GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
• GM regularly updates production and service part designs to integrate new materials and technologies

CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

EGT sensors frequently seize in the exhaust bung, making replacement difficult and damaging the bung. This Dorman OE FIX solution directly replaces the sensor and comes with a bung repair kit just in case.

Product Features:

• Convenient solution – this replacement EGT sensor comes with a bung repair kit in case the bung is damaged during removal
• Cost-effective fix – bung repair kit allows direct repair of damaged bung instead of replacing entire exhaust pipe
• Complete kit – comes with sensor, new bung, weld-on plate and zip tie
• Quality engineering – designed in the United States and backed by decades of automotive aftermarket experience

DynoMax Ultra Flo Welded performance stainless steel mufflers feature 100-percent welded construction for lifelong durability. The unrestricted, straight-through design dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower. Each muffler

Product Features:

• Stainless steel construction for lifelong protection
• 100% welded design for maximum durability
• Straight through design ensures unrestricted exhaust flow and reduces back pressure
• CRF Technology absorbs unwanted interior resonance while maintaining a deep performance tone
• Dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower.

Designed to deliver superior flow and OE-style sound, Walker® Quiet-Flow® mufflers are available for top-selling domestic and foreign vehicles.

Product Features:

• EASY TO INSTALL — Direct-fit bolt-on replacement solution with OE-style hangers, brackets and pipe routings for easy installation and doesn’t require specialized fabrication and/or welding
• RESISTS CORROSION — Internal drainage system helps reduce moisture collection
• BUILT TO LAST — Internal partitions and mechanically joined tubes allow expansion and contraction during temperature changes to minimize distortion while spun-locked heads and OE-style spot welds provide stability and longer service life
• PREMIUM ACOUSTIC CONTROL — OE-style louvered tubes lower noise levels while OE-style domed heads help reduce radiated noise for premium factory-style sound quality compared to straight perforated tubes
• DESIGN VALIDATED — Acoustic and flow tested for quality OE-style sound you can count on

This exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles, and is made from quality materials for reliable performance.

Product Features:

• Direct replacement – this exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles
• Ideal solution – this kit is a reliable replacement for the original hardware that is missing or damaged, or has failed
• Durable construction – this kit is made from quality components to ensure reliable performance and a long service life
• Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

This exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles, and is made from quality materials for reliable performance.

Product Features:

• Direct replacement – this exhaust manifold hardware kit matches the original hardware required to secure the exhaust manifold to the engine on specified vehicles
• Ideal solution – this kit is a reliable replacement for the original hardware that is missing or damaged, or has failed
• Durable construction – this kit is made from quality components to ensure reliable performance and a long service life
• Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

Our exhaust manifold flange kit includes all necessary studs and nuts for a complete repair.

Product Features:

• Direct replacement for a proper fit every time
• Durable steel construction
• New hardware helps fix exhaust leaks
• Also available in the Exhaust Manifold Hardware Kit

This exhaust flange stud and nut are designed to match the fit and function of the original hardware on specified vehicles. Made of quality materials, this hardware is engineered for reliable performance.

Product Features:

• Upgraded hardware – this set of six M10-1.5 exhaust manifold mounting studs and nuts are 100 percent stainless steel for superior heat and corrosion resistance
• Convenient solution – kit contains all the application-specific hardware necessary to join one exhaust manifold to one manifold flange
• Matches fit – this hardware matches the fit and function of the factory fasteners, while offering superior durability
• Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

This exhaust manifold to cylinder head repair clamp is designed to match the fit and function of the original clamp on specified vehicles, and is engineered for durability and reliable performance.

Product Features:

• Saves time – When an exhaust manifold fastener breaks, this exhaust manifold repair clamp saves time by creating a seal without needing to extract the broken stud
• Location-specific – engineered to fit the exhaust manifold on the front left or rear right on specified GM and Isuzu vehicles
• Complete kit – includes clamp and fasteners for a thorough, secure repair
• Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

Our Exhaust Manifold Hardware Kit comes with the necessary installation components to assist you in replacing your manifold. Save time and energy by having the right hardware on hand when you need it.

Product Features:

• Direct replacement for a proper fit every time
• Durable steel construction
• Repair kit helps to secure exhaust manifold to the vehicle engine head
• Manufactured to strict engineering quality standards

Made from aluminized steel for durability, Walker® premium pipe is manufactured with precision benders and fixture checked to ensure a precise fit for quick and easy installation.

Product Features:

• RESISTS CORROSION — Durable aluminized steel construction for corrosion resistance and performance
• EASY TO INSTALL — Manufactured with precision bends and OE-style routings, hangers and connectors for easy installation (where applicable)
• OE-STYLE PERFORMANCE — Direct-fit design is fixture checked to ensure a precise fit that performs like original equipment
• BETTER TOGETHER — Use premium Walker accessories when installing Walker catalytic converters and mufflers for a complete exhaust system upgrade
• AVAILABLE IN DIFFERENT SIZES — Offered in a variety of lengths and diameters and features the appropriate Inlet Diameter (I.D.) – Outlet Diameter (O.D.) connection; see product specifications for more information

Made from aluminized steel for durability, Walker® premium pipe is manufactured with precision benders and fixture checked to ensure a precise fit for quick and easy installation.

Product Features:

• RESISTS CORROSION — Durable aluminized steel construction for corrosion resistance and performance
• EASY TO INSTALL — Manufactured with precision bends and OE-style routings, hangers and connectors for easy installation (where applicable)
• OE-STYLE PERFORMANCE — Direct-fit design is fixture checked to ensure a precise fit that performs like original equipment
• BETTER TOGETHER — Use premium Walker accessories when installing Walker catalytic converters and mufflers for a complete exhaust system upgrade
• AVAILABLE IN DIFFERENT SIZES — Offered in a variety of lengths and diameters and features the appropriate Inlet Diameter (I.D.) – Outlet Diameter (O.D.) connection; see product specifications for more information

This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair.

Product Features:

• Ideal replacement – this exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
• Reliable construction – durable materials resist warping, cracking and leaking for long-lasting performance
• Complete repair – includes all necessary gaskets and downpipe hardware
• Trustworthy design – built by industry leader in aftermarket manifolds

This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair.

Product Features:

• Ideal replacement – this exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
• Reliable construction – durable materials resist warping, cracking and leaking for long-lasting performance
• Complete repair – includes all necessary gaskets and downpipe hardware
• Trustworthy design – built by industry leader in aftermarket manifolds

This exhaust clamp is designed to match the function of the original equipment clamp on specified vehicles. Manufactured from quality materials for reliability, it is engineered to help ensure secure connections between exhaust system components.

Product Features:

• Direct replacement – this exhaust clamp is designed to match the function of the original equipment clamp on specified vehicles
• Ideal solution – engineered to help ensure secure connections between exhaust system components
• Durable construction – designed and manufactured to strict specifications for reliable performance
• Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

Complete your exhaust repair with an Exhaust Mate® U-bolt clamp. Designed to ensure a tight, leak-resistant connection, Exhaust Mate hardware is manufactured from durable and robust material for long service life.

Product Features:

• CONNECTS EXHAUST PARTS — Provides secure, leak-resistant connection
• AVAILABLE IN DIFFERENT SIZES — Offered in a variety of styles and sizes for a quality vehicle repair
• PREMIUM MATERIALS – Made from quality material for durability and long life
• BETTER TOGETHER — Use Walker® accessories when installing catalytic converters and mufflers for a complete exhaust system upgrade

This exhaust clamp is designed to match the function of the original equipment clamp on specified vehicles. Manufactured from quality materials for reliability, it is engineered to help ensure secure connections between exhaust system components.

Product Features:

• Direct replacement – this exhaust clamp is designed to match the function of the original equipment clamp on specified vehicles
• Ideal solution – engineered to help ensure secure connections between exhaust system components
• Durable construction – designed and manufactured to strict specifications for reliable performance
• Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience