MBRP 4" XP Series Downpipe-Back Exhaust System S6004409

2001-2007 GM 6.6L Duramax (All Crew & Ext. Cabs)
MBRP Performance Exhaust
Mfg. Number:
XDP Part Number:
$5 Price Beat Guarantee
XDP - MBRP Authorized Online Retailer XDP is a MBRP Factory Authorized Online Retailer ID# 600207727. We would like you to shop with confidence knowing your purchase is covered by the manufactures warranty.   

The Best Systems Start with the Best Materials

MBRP'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 to Perform

You count on your truck to tow all of your gear to where you want it. With your MBRP performance exhaust you can make that happen with up to18 HP more horsepower and 28 ft/lb more torque. Give your truck more pulling power and much improved throttle response with an MBRP 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 200ºF and set the stage for all the performance you want. An MBRP performance exhaust system is the starting point to getting the most from cold air intakes, programmers, modules and downloaders.

Easy Installation
MBRP systems are as much fun to install as to drive with on your truck. Bolt-on, no weld design makes installing this on your truck a no hassle one and a half to two hour project. Everything is direct fit to the OEM hangers and you get all the clamps and parts you will need, all in one box, no matter what configuration of truck you have.

Sound & Style

Performance is one thing but at MBRP we believe that appearance and sound is just as important. Every MBRP performance exhaust system has been specifically tuned to get the optimal sound from your pickup. With our MBRP brand etched on the tip and our unmistakable styling, there's no question that you have the hottest exhaust on the road - MBRP.


  • 4" Stainless Steel 
  • Downpipe-Back Exhaust System
  • Lifetime Warranty
  • Rich, Mellow Exhaust Note
  • Installs With Common Hand Tools
Regular Cab's Require Adapter Pipe Below.

Application Note:
All Crew & Extended Cabs applies to  GM 2500HD/3500HD Pickups. This system is not designed for use on Cab & Chassis models. This system will fit on Regular Cab models but requires the use and purchase of the Regular Cab Adapter Pipe below.

Buy Now and receive a MBRP T5051 mirror polished stainless steel angled cut exhaust tip(s) FREE!

Free MBRP Exhaust Tip

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(2 Ratings, 1 Review) Average Rating:
Installation easy. Sounds and looks great.
Chris (Spokane, WA) 9/9/2015 4:49 AM
Bought the XP kit for my Duramax. Was looking for a richer exhaust note over stock as well as increased power and reduced EGT's. Installation took a couple hours with all the right tools. If you don't have a lift you'lol need to make a cut in the factory exhaust just behind the muffler. A sawzall works good for this. The pictures could have been a little larger and more clear, but the step by step written instructions worked well. The new exhaust looks bad ass and sounds killer. Thanks MBRP and XDP Diesel!