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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.

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.

Specification

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

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- 2017-2025 Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax
- Will not fit Cab & Chassis trucks.

If you would like to purchase the black version, please click the link

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Fast Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy

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

3.5'' Downpipe Exhaust For 2017-2025 L5P 6.6L Duramax Diesel | SPELAB