3.5" Downpipe Exhaust for 2017-2023 GM 6.6L Duramax L5P

Product Description

The factory downpipe on the 2017-2023 6.6L Duramax L5P is notorious for being crushed and highly restrictive, creating a massive bottleneck immediately after the turbocharger. The Delete.Autos 3.5" High-Flow Downpipe solves this critical issue. By maintaining a true 3.5-inch diameter through smooth mandrel bends, this downpipe allows hot exhaust gases to exit the engine much faster.

Performance Advantages

• Lower EGTs: Faster exhaust evacuation means less heat gets trapped in the manifold and turbo housing, crucial for heavy towing.
• Enhanced Sound: Experience a more pronounced and aggressive turbo whistle that the factory downpipe muffles.
• More Power: Reducing backpressure directly translates to more efficient turbo operation, yielding noticeable gains in horsepower and torque across the powerband.

Vehicle Fitment

Direct bolt-on replacement for 2017, 2018, 2019, 2020, 2021, 2022, and 2023 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax L5P engine.