MBRP 4" Installer Series Downpipe-Back Exhaust System S6004AL

2001-2007 GM 6.6L Duramax (All Crew & Ext. Cabs)
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MBRP Performance Exhaust
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

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 MBRP 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 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" Aluminized Steel Construction
  • Downpipe-Back Exhaust System
  • 3 Year Warranty
  • Rich, Mellow Exhaust Note
  • Installs With Common Hand Tools
  • Mirror Polished, T304 Stainless Steel Exhaust Tip

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.

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

Free MBRP Exhaust Tip


Mfg. Number:

Customer Reviews - Include your order number for a chance to win a $100 GiftCard

(29 Ratings, 9 Reviews) Average Rating:
Great product
CODY (AZ) 4/25/2012 7:49 PM
Great product! somewhat simple to install in driveway. The only real difficult part is getting the old system off without having a lift. You have to cut the old system out in pieces. But since that has nothing to do with the product I give it a five star. sounds great (has a nice deep rumble to it). went from 19 MPGs (stock) to 21 MPGs. Noticable power increase. As well as a better responce time. Also noticed that when you let off the throttle the truck does not seem to have so much resistance. Over all it is a "Great Product". P.S also installed the turbo back extension.
02 Chevy Duramax
Bill (Co) 3/13/2012 8:38 PM
easy to install and sounds great up the fuel mileage about 2 mpg
2006 Chevrolet Duramax
Andy (MN) 4/14/2011 2:28 PM
Awesome exhaust! Easy to install - about one hour with the truck on a lift. I wanted louder than stock exhaust, but not too much, and this was perfect. Very awesome turbo spooling wistle. A+ and highly recommended!
2004 chevy duramax
jr (nb) 7/20/2010 5:43 PM
excellent product ,took about 1 hour to install,fit just right.sounds great ,not too loud to give you a headach on a long trip.thanks xdp for the great service.
Great pipe
Loran DeLong (Littleton, CO) 7/11/2010 1:25 PM
I get alot of comments on how good it sounds. Increase power and MPG, Also installed the down pipe to get rid of the cat, I have a 33' toy hauler Do not know its there. I suggest this to any one, And it is easy to install, less than two hours.