HomeShop by DepartmentPerformanceExhaustDown PipesMBRP 3" Turbo Down Pipe w/3 bolt flange style connection - 15.5-16 GM Duramax LML - GM8428
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MBRP 3" Turbo Down Pipe w/3 bolt flange style connection - 15.5-16 GM Duramax LML - GM8428

Thoroughbred Sku #: MBRGM8428
Manufacturer Sku #: GM8428

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Install Sheet - PDF:
Prop 65:
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
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This part is NOT available to ship to the state of California.


$294.99

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Product Details

Product Name: MBRP 3" Turbo Down Pipe
Manufacturer: MBRP
Manufacturer Part #: GM8428
Thoroughbred Diesel Part #: MBRGM8428
Fitment Notes: MBRP 3" Turbo Down Pipe - 15.5-16 GM Duramax LML w/3 bolt flange style connection - GM8428

MBRP 3" Turbo Down Pipe
2015.5-2016 GM Duramax LML w/ a 3 bolt flange style connection

Replace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance.

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. Not for sale or use in the state of California.

  • Greater Heat Retention
  • 20% Greater Flow Over Stock
  • Richer Diesel Sound
  • Will not Affect Emissions (DPF system or the Urea injection system)
  • Gains of +21 HP and +24 lb/ft Torque
  • Only works with a 3 bolt flange style connection

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  • Is there a 4" downpipe to fit a 95 dodgec3500 5.9 with a pacbrake exhaust flange (4")

    Jerry bayer | 11/19/2025

    No, you will have to modify a 4" downpipe.