MBRP 4" XP Series Cat-Back Exhaust System S6000409

2001-2005 GM 6.6L Duramax (All Crew & Ext. Cabs)
✔ QuickShips by Next Business Day*
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

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 
  • Cat-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 can be used on Regular Cab models with the purchase of the Regular Cab Adapter shown below.

Buy Now and receive a MBRP T5051 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

(19 Ratings, 7 Reviews) Average Rating:
Great Sound
Blake (Virginia) 3/22/2010 6:55 AM
Just bought the exhaust system and it was a quick and easy install. The only hard part was getting the stock exhaust off, other than that it was a piece of cake. Great tone and sound to it when you are just driving slow or when you stomp on the pedal the roar is amazing. Love it!!!
mike darosa (Taunton , MA) 3/17/2010 5:47 PM
installed on a 01 XC LB GMC quick, easy and sounds amazing GREAT PRODUCT!
Dually Driver
Kameron (Kansas) 5/10/2009 5:27 AM
Instant Difference, I combined it with the Volant Cold Air Box and the Edge Tuner I bought on XDP the fuel saving and performance is great.
Excellent exhaust system.
John (Mesa, AZ) 1/1/2009 11:26 PM
Installed on 06 CC SWB 4X4 GMC myself. It only took about 1hr. Greatly reduced turbo lag, turbo whistles more(I like that), and power gain is very noticeable. It also sounds really good, gives truck a nice growl. I would definitely recommend this system.
great system
camron (Unknown) 10/25/2007 7:08 PM
overall easy intstall, great look and comes with a real great agressive sound...glad i bought it with the muffler delete pipe...