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

By removing the factory downpipe and replacing it with a high-flow aftermarket downpipe, you are allowing your Duramax turbo to more efficiently move gases away from the turbine, which creates more power.

6.6 Duramax Downpipe Fitment

2017+ L5p Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks

2011-2016 LML Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks

2004.5-2010 LBZ LLY LMM Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks.

*Will not fit Cab & Chassis trucks.

6.6 Duramax Downpipe Specification

Material: Stainless Steel

Surface: Mirror Polish

Color options: 2017+ L5p has silver & black options, 2015.5-2016 LML has silver & black options, 2004.5-2010 LBZ LLY LMM has silver & black options.

6.6 Duramax Downpipe 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.

6.6 Duramax Downpipe Benefits

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 use a high-flow catalytic converter or remove the catalytic converter altogether.

By removing the factory downpipe and replacing it with a high-flow aftermarket downpipe, you are allowing your Duramax turbo to more efficiently move gases away from the turbine, which creates more power.

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Easy Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy.