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Part #:

AFE 49-4403X MACH Force XP 4" Downpipe-Back Race Exhaust

2011-2015 GM 6.6L Duramax LML (ECLB, CCSB & CCLB Configurations Only - Does not fit ECSB)
Part #:
FROM 451.25
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The AFE 49-4403X MACH Force XP 4" Downpipe-Back Race Exhaust for your 2011-2015 GM 6.6L Duramax LML is engineered to go give your truck the edge in competition! Built from durable T409 stainless steel, the AFE MACH Force XP Exhaust System will increase power and performance in your pickup. This face exhaust system features a 4" diameter for increased flow. Available with and without tip or muffler.

  • 4" Stainless Steel Construction
  • Mandrel Bent For Maximum Flow
  • Off-Road Downpipe-Back Exhaust

System Options
With Muffler & Tip 49-44032
No Muffler, No Tip 49-44031NM

Fitment Note: This front pipe will only fit 2015 models manufactured before July 2014. Models built after July of 2014 are equipped with a 3-bolt down pipe flange connection that is not compatible with this product.

Warning: This free-flow race exhaust system requires the use of an aftermarket performance programmer with off-road tuning.


  • Manufacturer Name AFE
  • Shipping Weight 80.00 lb.
  • Shipping Length 14 in.
  • Shipping Width 60 in.
  • Shipping Height 19 in.
  • Warranty Yes
  • Warranty Info 2 Year
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Valid for all orders over the phone or online, *excluding the manufacturers listed in the company policy. You will still receive FREE SHIPPING on purchases over $50! This promotion is valid now - 12/21/18 only.

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.