Part Number: GM8425

2001-2004 Duramax 3" Downpipe (GM8425)

$249.99 CAD
  • 2001-2004 Duramax 3" Downpipe (GM8425)-Downpipe-MBRP-GM8425-Dirty Diesel Customs

Part Number: GM8425

2001-2004 Duramax 3" Downpipe (GM8425)

$249.99 CAD
These cannot be shipped to the USA. Learn more

Fits: 2001-2004 GM LB7 w/ 6.6L Duramax

MBRP Exhausts are designed to fit all wheelbase & cab configurations unless otherwise specified.

Remove the restrictive OEM downpipe and replace it with MBRP's GM8425 3" Downpipe. This will help your LB7 breath by increasing the exhaust flow of your turbocharger. Featuring full 16 gauge mandrel bent tubing to maximize flow, as well as an extremely durable high-temperature ceramic coating, these pipes will deepen the sound of your Duramax while lowering EGT's and provide a quicker throttle response. The install process is as simple as it gets from the precision bending that you'd expect from an MBRP kit.


  • Mandrel Bent To Maximize Flow
  • Ceramic Coated
  • Improved Heat Retention & Dissipation
  • 20% Greater Flow Over Stock
  • Increased Performance
  • Throatier Sound
  • Faster Spool-Up



  • The Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction
  • Ensure that the intended use of this product is permitted

MBRP Part Number: GM8425


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  • Can this be shipped to the USA?

    Yes, we are able to ship this downpipe to the USA.

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