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USD 749.99
Part #: MBS6006AL

MBRP 4" Dual Installer Series Downpipe-Back Exhaust System S6006AL

2001-2004 GM 6.6L Duramax (All Crew & Ext. Cabs)
Part #: MBS6006AL
★★★★★ ★★★★★ 1 Reviews
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The Best Systems Start with the Best Materials
The MBRP 4" Dual Installer Series Downpipe-Back Exhaust System S6006AL is built from heavy-duty aluminized steel for your 2001-2004 GM 6.6L Duramax LB7. The MBRP Installer Series performance exhaust systems offers 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, MBRP's fully sealed tubing adds years to your system. Constructed to the same specifications as MBRP's top of the line Pro Series, MBRP backs 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 and 28 ft/lb more torque. Give your truck more pulling power and much improved throttle response with an MBRP diesel exhaust system. 

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 200 degrees 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. The bolt-on, no weld design makes installing this on your truck a no hassle 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 the MBRP brand etched on the tip and MBRP's unmistakable styling, there's no question that you will have the hottest exhaust on the road - MBRP.

  • 4" Aluminized Steel Construction
  • Downpipe-Back Dual Exhaust System
  • 3 Year Warranty
  • Rich, Mellow Exhaust Note
  • Installs With Common Hand Tools 
  • Mirror Polished, T304 Stainless Steel Exhaust Tips
Application Notes: 
All Crew & Extended Cabs applies to GM 2500HD/3500HD pickups. 
Regular Cab Adapter Pipe Needed For Reg. Cab Models (see related products)
Dual Exhaust Systems are not recommended for use on trucks with in-bed hitch. 


  • MFG. Number S6006AL
  • Manufacturer Name MBRP Inc.
  • Shipping Weight 94.00 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 Aluminized Steel
  • UPC 882963101822
  • Warranty Yes
  • Warranty Info 3 Year
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
3.0/5 Stars out of 1 Reviews
Poor fit exhaust system
(H) | August 27th, 2020
I have installed several aftermarket exhaust Systems this one did not fit correctly I cut the exhaust as recommended from the directions For extended cab pickups it did not fit at all we had to add the 9.1/2 pipe I cut back on and an additional 4” of pipe to the muffler for the passenger side tailpipe to fit the drivers side tailpipe fit after we added the 9-1/2 “ pipe back on will never buy MBRP again the exhaust does sound good

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Questions and Answers

Is there a big difference in durability between aluminized steel and stainless steel?
View Staff Answer 
The MBRP Aluminized systems are designed to provide a high quality exhaust system with the budget conscious in mind. Built from 100% Aluminized steel the system is manufactured with the same high quality design and craftsmanship as the Pro & XP series, but at a value price. The aluminized series system is best suited for areas with moderate environmental conditions. The MBRP Stainless Steel is much more rugged & dependable. Made from T409 Stainless Steel and built to handle the harshest road conditions. The Stainless Steel will oxidize but it will not rust through like the aluminized can in more extreme environmental conditions.

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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.