Skip to product information
1 of 1


GDP Downpipe Back Exhaust - Single (2020-2023 GM 2500/3500 6.6L Duramax L5P)

GDP Downpipe Back Exhaust - Single (2020-2023 GM 2500/3500 6.6L Duramax L5P)

Regular price $490.00 USD
Regular price Sale price $490.00 USD
Sale Sold out
  • Control
  • Innovation
  • Satisfaction

Built to Last:

  • Constructed from heavy-duty T409 stainless steel for maximum durability.
  • Mandrel-bent for a perfect fit and improved airflow.
  • Improved flanges ensure a leak-free connection.

Effortless Installation:

  • Includes clamps, pre-welded contour bent hangers, and strong flanges for a hassle-free installation.

Performance Gains:

  • Expect increased horsepower, lower Exhaust Gas Temperatures (EGTs), and improved airflow.
  • Unleash your truck's potential and let it breathe easier with DIESELR!
  • Hear the difference! DIESELR performance exhaust delivers a throatier sound.


  • Fit for specific cab and box configurations (EC-CC/SB-LB-Dually) on 2020-2023 GM 2500/3500 6.6L Duramax L5P.
  • Important Note: This exhaust system ONLY fits models equipped with the OEM style 4-bolt flange off the turbo direct pipe.


  • OEM Style 4-Bolt Flange for a secure and familiar fit.
  • No Bungs, allowing for customization based on your specific needs.

Important Disclaimer:

  • This product requires aftermarket tuning and is intended for off-road competition use only.
  • Installation on emission-controlled vehicles may violate regulations. Please check your local laws before installation.
View full details