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GM/Chevy 3.5" Downpipe L5P Duramax | 2017-2023

The Diesel Dudes is a family owned business in Montreal, Canada. Our mission is to serve diesel truck owners with high quality parts and software, while providing excellent customer service along the way. 

If you have any questions about our products, or if you are wondering what kit is best for your truck, please reach out. 

Since our inception, our entire goal was to answer any and all questions our customers have. 

We get it, tuning can be complicated, and getting it wrong can damage your truck. That's why we went out of our way to find only the best tuning options for each and every truck model and year, and when we couldn't find a good enough option, we made our own. 

That's right, while we are the authorized dealer for many tuning companies, such as GDP and Proven Diesel, our technicians make many of our tunes in house. 

So either way, we have in house technical support on all of our products, in case you get stuck on the installation. But our installation guides and videos should be more than enough to get you going. 

Just remember, if you ever have questions, just call us at 888-830-2588 and our team will help you out!

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Regular price $449.00
Regular price Sale price $449.00


Vehicle Fitment:
2017, 2018, 2019, 2020, 2021, 2022, 2023 Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax L5P pickup trucks


Description: This 3.5" turbocharger downpipe (also known as the turbo direct pipe) will remove the DOC and increase exhaust flow out of the turbo, improving performance.  There are other versions of this pipe that start behind the Diesel Oxidation Catalysts, leaving it installed for emissions-on setups but this pipe will fully remove the DOC for the best airflow and power gains. Both DPF delete pipes, and full exhaust systems do not include a DOC delete, this pipe is needed to fully remove your emissions but isn't required for a delete tune. 



  • 3.5" Stainless Steel Piping
  • 20% better flow than the factory pipe
  • Heat wrap included keeping engine bay temperatures down
  • Greater heat-retention
  • Will not affect emissions systems
  • Maximum flow for competition applications
  • 4-bolt flange, two studs installed
  • Completely eliminates the DOC

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