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Part #: AFE49-44066

AFE 49-44066 Large Bore HD 4" Race Pipe

2011-2015 GM 6.6L Duramax LML
Part #: AFE49-44066
$372.39 $ $335.15
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The AFE 49-44066 Large Bore HD 4" Race Pipe for your 2011-2015 GM 6.6L Duramax LML is constructed from mandrel-bent stainless steel tubing for maximum flow, increased horsepower, increased torque and lower EGT's. LARGE BORE HD exhaust race pipes are the perfect combination of performance, fit and value. Uses OE mounting hangers for secure mounting and hassle-free installation. The factory exhaust system will require to be cut prior to installation.

Leak-Free Seal:
High quality OE style flanges are used for a complete 360 degree sealing surface. 

Perfect 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:
MACH Force XP exhaust race pipes are constructed of 4" mandrel-bent stainless steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGTs.


  • Retains Factory Tail-Pipe 
  • 4" Mandrel-Bent Stainless Steel Construction
  • OE Bayonet Style Flanges For Secure Mounting 
  • High Quality OE Style Flanges For 360 degree Sealing Surface 
  • Uses Factory Mounting Locations For Hassle- Free Installation 
For 2015 models with v-band connection at front-pipe. 
Requires cutting of the factory exhaust system for installation 

Fits: Crew Cab/Short Bed (153.7" Wheelbase), Crew Cab/Long Bed  (167.7" Wheelbase), Extended Cab/Short Bed  (144.2" Wheelbase), Extended Cab/Long Bed (158.2" Wheelbase) & Standard Cab/Long Bed (133.7" Wheelbase) models.

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


  • MFG. Number 49-44066
  • Manufacturer Name AFE
  • Shipping Weight 30.00 lb.
  • Shipping Length 60 in.
  • Shipping Width 14 in.
  • Shipping Height 19 in.
  • UPC 802959600139
  • Warranty Yes
  • Warranty Info 2 Year
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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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.