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01-07 Chevy Duramax MBRP Stainless 4" Exhaust System Off Road


The Best Systems Start with the Best Materials 

The MBRP 4" XP Series Downpipe-Back Exhaust System S6004409 is the exhaust of choice for the 2001-2004 GM 6.6L Duramax LB7 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. MBRP backs their XP Series 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 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.  

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 MBRP believes 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 an MBRP brand etched on the tip and their unmistakable styling, there's no question that you will have the hottest exhaust on the road.


  • 4" Stainless Steel 
  • Downpipe-Back Exhaust System
  • Free-Flowing Performance Muffler
  • Lifetime Warranty

Application Note: 

All Crew & Extended Cabs applies to GM 2500HD/3500HD Pickups. Not for use on Cab & Chassis. 

This system will fit on Regular Cab models but requires the use and purchase of the Regular Cab Adapter Pipe below. 

Vehicles originally equipped with a catalytic converter must retain the factory catalytic converter. Removal of the catalytic converter may be a violation of federal or local regulations.

MBRP: S6004409

This item cannot ship to California.

Lame California Prop 65 Notice
Tags: MBRP , Stainless , Off , road , exhaust , system , duramax , lbz , lly , lb7 , s6004409