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MBRP Exhaust Systems - S6120409

DPF Back - XP Series Exhaust
  • $334.99
  • Free Shipping
  • Ships Between 1/23 - 1/25
  • What Do You Drive?


  • Style:
    4" Single side exit
  • Part #:
  • 4" pipe
  • 409 Stainless Steel
  • Includes single-wall polished stainless steel tip
  • Lifetime Warranty
  • Download installation instructions (PDF)
  • Retains factory diesel particulate filter

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MBRP Exhaust Systems Part #S6120409 Customer Reviews

Average Rating

4 Customer Reviews


Reviewed by Lee W (Thomaston, ME) — Oct 11, 2012 5:04 PM

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Would definately buy from AutoAnything again as well as MBRP!!

MBRP 4" DPF-Back 409SS Exhaust System

Reviewed by Michael M (Kansas City, MO) Reviewed for a 2010 Dodge Ram — Oct 26, 2008 3:41 AM

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10 of 10 people found the following review helpful.

Excellent quality product, easy to install and lifetime warranty. The lowest price you will find anywhere for this system on the internet. Have already noticed improved mileage and performance!

Motorist seeking better diesel fuel mileage

Reviewed by Tim B (Brookline Sta, MO) Reviewed for a 2007 Dodge Ram — Jun 21, 2008 1:30 PM

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10 of 10 people found the following review helpful.

I installed my mbrp exhaust system on my 2007 Dodge Cummins 6.7 liter. Direct bolt on behind particulate filter .I noticed immediately a better turbo spool up and better throttle responce at highway speeds. Not sure of fuel economy yet. With no factory muffler I was concerned that it would be to loud, noticed very little difference in loudness.

diesel 4" exhaust

Reviewed by Gary H (Sandy, OR) Reviewed for a 1972 Chevy Chevelle — Jun 12, 2008 4:14 AM

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1 of 1 people found the following review helpful.

The directions were clear and the installation was easy. It took only about 30 minutes with hand tools. I don't know that there will be much actual performance/mileage improvement as the factory exhaust is already 4" and the muffler is straight through design. Only real differences are mandrel bends, the elimination of the factory muffler, and the polished tip.