2017-2023 Duramax L5P 3.5" L5P Downpipe (L5P-EXH-A004)

If you're building an L5P Duramax, one of the first upgrades you require is the upgraded 3.5" L5P Downpipe. From the factory, the L5P comes with an extremely restrictive crushed downpipe that does nothing but raise your EGT's and rob you of power.