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Part #: MBSS9000AL

MBRP S9000AL 4" Installer Series Downpipe-Back Dual Stack Kit (w/Tips)

2001-2007 GM 6.6L Duramax (All Crew & Ext. Cabs)
Part #: MBSS9000AL
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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.   

MBRP "Smokers" Stack System
Some people love stacks because of the awesome rumble that they make cruising down the street. For others it's the big rig look of stacks crowning their truck. Who's right - who cares? You get both with MBRP's SMOKERS.

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 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.

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 unmistakable styling, there's no question that you have the hottest exhaust on the road - MBRP.


  • 4" Aluminized Steel Construction
  • Downpipe-Back Dual Stack Exhaust System
  • Includes (2) 6" Angle Cut Stacks
  • 3 Year Warranty


  • MFG. NumberS9000AL
  • Manufacturer NameMBRP Inc.
  • Shipping Weight96.00 lb.
  • Shipping Length60 in.
  • Shipping Width17 in.
  • Shipping Height12 in.
  • Diameter4"
  • Exhaust ExitDual Stack
  • Exhaust TypeDownpipe-Back
  • MaterialAluminized Steel


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Questions and Answers

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Most Popular Questions

Does the MBRP4XP S9000409 fit on a 2005 crew cab?
View Staff Answer 

Yes, The system will fit both Crew Cab & Extended Cab trucks.

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.