3''/3.5'' Downpipe For 2004.5+ L5P LML LLY LBZ LMM 6.6L Duramax Diesel

3''/3.5'' Downpipe Exhaust For 2004.5+ L5P LML LLY LBZ LMM 6.6L Duramax Diesel

The downpipe on your turbocharged vehicle is directing the exhaust gases out of the turbine housing into the exhaust system. An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether.

By removing the factory downpipe and replacing it with a high flowing unit you are allowing the turbo to more efficiently move gases away from the turbine which creates more power. Since the factory restrictions are now gone you can increase the boost on the vehicle as the factory downpipe is a choking point for performance.

Fitment

• 2017+ Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks
• 2011-2016 Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks
• 2004.5-2010 Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks.

Will not fit Cab & Chassis trucks.

Key Features

• 3.5-Inch Large Diameter Design: Features a larger internal diameter than the stock pipe for dramatically increased exhaust flow, reducing turbo lag and enhancing throttle response.
• Turbo Efficiency Optimization: Accelerates exhaust gas exit from the turbine housing, minimizing backpressure to allow the turbo to spin faster and produce more boost and power.
• Eliminates Factory Restriction: Directly replaces the restrictive OEM downpipe, solving the exhaust choking point and providing the essential foundation for further performance mods (e.g., tuning, increasing boost levels).
• Precision Fit and Durability: Constructed from high-quality stainless steel for superior corrosion resistance and long-term reliability under extreme heat.

What does a downpipe do?

The downpipe on your turbocharged vehicle is directing the exhaust gases out of the turbine housing into the exhaust system. An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether.

By removing the factory downpipe and replacing it with a high flowing unit you are allowing the turbo to more efficiently move gases away from the turbine which creates more power. Since the factory restrictions are now gone you can increase the boost on the vehicle as the factory downpipe is a choking point for performance.

Specification

• Application: Downpipe Exhaust
• Material: Stainless Steel
• Surface: Mirror Polish