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Part #:

AFE 49-44044 MACH Force XP 4" Dual Downpipe-Back Race Exhaust System

2011-2015 GM 6.6L Duramax (All Cabs & Beds)
Part #:
FROM 945.25
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The AFE 49-44044 MACH Force XP 4" Dual Downpipe-Back Race Exhaust System for your 2011-2015 GM 6.6L Duramax is constructed from 4" mandrel-bent stainless steel. This exhaust system will provide a mild, throaty tone with a 12" long muffler and installs easily with high-quality band clamps and OE-style bayonet hangers. Designed for ease of install, this exhaust system will reinstall using the factory mounting locations and comes complete with a bolt-on bracket that supports the driver side tailpipe. The finishing touch is your choice of a polished or powdercoated exhaust tip. MACH Force exhaust systems are the perfect combination of performance, fit and value.

Single To Dual Exhaust Conversion:
This exhaust is designed to convert the standard single exhaust into an aggressive dual exhaust.

Fits With Spare Tire:

This exhaust system fits perfectly without relocating the spare tire.

OE Fit:
OE-style bayonet hangers are used to maintain a stable pipe location during high vibration and high heat conditions. The bayonet tip holds the hanger bushing in place for an OE-style fit that does not change with time.

Flow and Performance:
This Mach FORCE XP exhaust system is constructed from 4" mandrel-bent stainless steel tubing for maximum flow in competition. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGTs.

Merge Collector:

This exhaust system uses a mitered merge collector to convert the standard single exhaust to an aggressive dual exhaust.

  • 4" Stainless Steel Construction
  • Downpipe-Back Race Exhaust System
  • Polished Or Black Exhaust Tips
  • Designed For Off-Road Competition Use
Exhaust Tip Finish
Polished 49-44044-P
Black 49-44044-B

Fitment Note: This exhaust 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.



  • MFG. Number49-44044
  • Manufacturer NameAFE
  • Shipping Weight55.00 lb.


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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.