Additional Images

L5P Duramax Downpipe

-3.5" Downpipe
-Reduced exhaust backpressure
-10-15whp power gains
-Direct bolt-on fitment, NO TUNING Required
-Includes sensor bungs
Availability: in-stock, ships within 1-business day
NOTE: This product has the following shipping restriction(s):
  • This product is not available for shipping to California
Pricing: $299.00

NOTE: This product has the following shipping restriction(s):
  • This product is not available for shipping to California
Free Ground Shipping Within The Continental US


An upgraded downpipe is hands down the best exhaust modification for a Duramax L5P. The factory downpipe is small and crushed which restricts exhaust flow and creates backpressure within the exhaust system. This backpressure then pushes up against, creating a force that restricts the turbine wheels ability to spin efficiently. Reducing backpressure greatly reduces the amount of force or stress on the turbo which allows it to spin more freely, increasing reliability, producing additional power, and allowing for higher levels of boost. 

Since the downpipe bolts directly to the L5P turbo increasing exhaust flow through the downpipe results in the greatest reduction in backpressure and therefore the biggest performance gains out of all the possible exhaust upgrades. In addition to horsepower and torque gains an upgraded L5P downpipe will result in a quicker turbo spool and lower EGTs which overall results in a more efficient turbo and a healthier engine.

While a downpipe is an effective upgrade on a stock L5P its benefits are amplified when you are tuned and running above stock boost levels. The additional exhaust flow and backpressure reduction help in allowing the turbo to hit the higher boost levels, more reliably. However, no tuning or custom tuning is required for our downpipe - it is a direct bolt-on fit and can be run completely stock.

Duramax L5P Downpipe Benefits:

  • -Approx. 10whp and 15-20wtq power gains (when tuned)
  • -Reduced exhaust backpressure
  • -Faster turbo spool
  • -Lower exhaust gas temps (EGTs)
  • -More efficient turbo (healthier + more reliable)

Our downpipe will add very minimal sound gains to your truck - the benefits are predominantly performance oriented. If you want solid sound gains then we recommend upgrading to a 4" or 5" emissions-back exhaust system. Our downpipe will bolt both to the stock exhaust system or any aftermarket system as well.

Boosted Performance Product Features:

  • -3.5" downpipe, more flow than smaller 3" downpipes on the market
  • -304 Stainless Steel - will not rust like inferior ceramic coated downpipes
  • -Heat shield to prevent heat transfer
  • -O2 bungs for sensors (can be plugged)
  • -Bolts on to factory or aftermarket exhausts
  • -Fits all 2017-2023 L5P models

Our downpipe is 3.5", stainless steel, and heat wrapped - the best combination around. We truly believe this downpipe is the best combination of price, quality, and performance available on the market.


This is an unfinished downpipe wrapped in heat wrap



Shipping Information

  • Item Requires Shipping
  • 7.0 lbs.
  • W10.0000” x H8.0000” x L23.0000”
  • Free Ground Shipping Within The Continental US

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.