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Dirty Diesel 2017-2020 Duramax 3.5" L5P Downpipe (L5P-EXH-A004)

Dirty Diesel 2017-2020 Duramax 3.5" L5P Downpipe (L5P-EXH-A004)


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Fits: 2017-2020 GM L5P w/ 6.6L Duramax

Note: Race Tuning Required to Run Downpipe

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.

Note: We recommend adding the EGR Upgrade Kit with this downpipe. It includes everything you need to fix your OEM EGR before it starts causing you problems and costing you money.


  • 3.5" Downpipe
  • Full Stainless Steel
  • Comes With High-Quality Heat Wrap Kit
  • Replaces Restrictive 'Crushed' OE Downpipe and Cat
  • Connects to Factory Turbo Outlet
  • Works with Any Aftermarket Race Exhaust System OR OEM System
  • 4-Bolt Flange

Note: Does Not Include Bungs for Sensors - Off Road Competition Use Only!

Part Number: L5P-EXH-A004

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