Products Showing Parts for — {{ }}

No Results Showing Parts for — {{ }}
USD 1019.99
Part #: MBS6006409

MBRP 4" Dual XP Series Downpipe-Back Exhaust System S6006409

2001-2007 GM 6.6L Duramax (All Crew & Ext. Cabs) (Off-Road)
Part #: MBS6006409
★★★★★ ★★★★★ 4 Reviews
$ $1,019.99
Our Recommendations Compatible Products
Scroll to View More


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 200F 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" T409 Stainless Steel Construction
  • Downpipe-Back Dual Exhaust System
  • Lifetime Warranty
  • Rich, Mellow Exhaust Note
  • Installs With Common Hand Tools
  • Mirror Polished, T304 Stainless Steel Exhaust Tips
  • Regular Cab Adapter Pipe Needed For Reg. Cab Models
  • Off-Road System - Removes Cat. Converter (Aftermarket Tuning Required)
Dual Exhaust Systems are not recommended for use on trucks with in-bed hitch.

Regular Cab Installation: To install this system on a Regular Cab model, you must purchase the MBRP Regular Cab Adapter. (see below)

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

Free MBRP Exhaust Tip


  • MFG. Number S6006409
  • Manufacturer Name MBRP Inc.
  • Shipping Weight 92.00 lb.
  • Shipping Length 60 in.
  • Shipping Width 20 in.
  • Shipping Height 14 in.
  • Fuel Type Diesel
  • Diameter 4"
  • Exhaust Exit Dual
  • Exhaust Type Downpipe-Back
  • Material T409 Stainless Steel
  • UPC 882963101815
  • Warranty Yes
  • Warranty Info Lifetime
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
4.75/5 Stars out of 4 Reviews
sounds sweet
Anonymous (Unknown) | June 21st, 2008
I installed this with a floor jack and stands and the only problem I had was getting clearance on the driver side pipe between the shock, spring and frame, I finally shortened the extend pipe 2" (this is on a 2003 crewcab long box) It took about 2 1/2 hours to install, I had a tough time removing stock nuts. other than that a nice install easy for an amateur.
quick68 (Unknown) | January 26th, 2007
Owner 04 GMC duramax crew cab 3500 dully
Henry Lopez-Calleja (Linden NJ) | August 25th, 2010
VERY satisfy with you product it took me about 2 hours to install very professionally product look great lots compliment, make my truck likes it should sound supered lots my friend an others ask were they could get it. Also it see to be ruing mush betters than before I expect my fuel mile should increase thank you for product sincerely HENRY LOPEZ-CALLEJA
Pages 1   2

Write a Review

Include Your Order Number For a Chance to Win a $100 Gift card

Overall Rating

Your Information

Email Address will not be made public.

Customer Photos

Customer Photos

See what others built Submit your photo

Questions and Answers

Ask XDP a Question about this product (Allow 24-48 hours for reply)

Most Popular Questions

Will this fit a 2004.5 duramax longbox?
View Staff Answer 
Yes it will. MBRP includes a cut-to-fit extension pipe so that the exhaust system can be used on all cab & bed configurations.
Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.