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MBRP 4 inch Exhaust-Dual Outlet-Down Pipe Back 01-07 6.6L GM Duramax

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MBRPinc's XP Series is the performance exhaust of choice for the enthusiast who needs a system that can take anything that the road throws at it. This system's rugged sixteen gauge T409 construction can be counted on to withstand everything from salt to rocks, tar to grime. We have had such success with this line that we back it with a Lifetime Warranty.


Built from heavy duty aluminized steel our Installer Series performance exhaust systems offer a value price without compromising on the quality built into every component. While the seams are a major point of rust through with some budget systems our fully sealed tubing adds years to your system. Constructed to the same specifications as our top of the line Pro Series we back this line with an industry leading 3 Year Warranty.

Built to Perform

You count on your truck to tow all of your gear to where you want it. With your MBRPinc performance exhaust you can make that happen with up to 18 HP more horsepower and 28 ft/lb more torque. Give your truck more pulling power and much improved throttle response with an MBRPinc diesel exhaust system. Our systems are so much more efficient, it will be easy to see what your truck can really do.

Minimize Backpressure

The secret to getting more out of your diesel engine is to give it lots of cool, clean air. The only way that you can get fresh air in is to get the hot air out. From the spiral louvered high flow muffler to the fully mandrel bent tubing to minimal bend degree angles, your MBRP performance system gets exhaust out fast. Drop exhaust gas temperature by up to 200

MBRP Performance 4" Exhaust-Dual Outlet-Down Pipe Back

2001-2007 6.6L GM Duramax LB7 / LLY / LBZ

  • Mirror polished T304 stainless steel tips
  • 3 Years Warranty or Lifetime Warranty On XP and Pro Series
  • Rich, mellow exhaust note
  • Installs with common hand tools
  • Boosts torque and horsepower
  • Specially designed for particulate filter emission control systems

MBRP 4 inch Exhaust-Dual Outlet-Down Pipe Back 01-07 6.6L GM Duramax fits the following vehicles:

  • 2001 GMC Sierra 2500
  • 2001 GMC Sierra 2500 HD
  • 2001 GMC Sierra 3500
  • 2002 GMC Sierra 2500
  • 2002 GMC Sierra 2500 HD
  • 2002 GMC Sierra 3500
  • 2003 GMC Sierra 2500
  • 2003 GMC Sierra 2500 HD
  • 2003 GMC Sierra 3500
  • 2004 GMC Sierra 2500
  • 2004 GMC Sierra 2500 HD
  • 2004 GMC Sierra 3500
  • 2005 GMC Sierra 2500 HD
  • 2005 GMC Sierra 3500
  • 2006 GMC Sierra 2500 HD
  • 2006 GMC Sierra 3500
  • 2007 GMC Sierra 2500 HD
  • 2007 GMC Sierra 3500 HD