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Part #: AFE49-44055

AFE 49-44055 Large Bore HD 4" Race Front Pipe

2015.5-2016 GM 6.6L Duramax LML (Fits 133.7"-167.7" Wheelbases)
Part #: AFE49-44055
$318.25 $302.34
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The AFE 49-44055 Large Bore HD 4" Race Front Pipe Race Front Pipe for your 2015.5-2016 GM 6.6L Duramax LML is constructed from 4" mandrel bent stainless steel tubing for maximum flow, increased horsepower and torque. The Race pipe is designed with a unique tapered flange to fit the flanged down pipes found on models built after July 2014. 

Installation is a Snap:
This System uses factory mounting locations providing stability and hassle-free installation.

Leak-Free Seal:
A unique tapered OE style flange is used for a complete 360 degree sealing surface.

Perfect Fit:
A OE style bayonet hanger is 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:
The LARGE Bore HD exhaust race pipe is constructed of 4" mandrel bent stainless steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower and torque.


  • 4" Stainless Steel Construction
  • Utilizes Factory Mounting Locations 
  • High Quality OE Style Tapered Flange 
Note: These kits will only fit models manufactured after July 2014 equipped with a flanged down pipe. Does not fit cab & chassis, Fits 133.7 " to 167.7" wheel bases only.


  • MFG. Number49-44055
  • Manufacturer NameAFE
  • Shipping Weight22.00 lb.
  • Shipping Length49 in.
  • Shipping Width13 in.
  • Shipping Height23 in.


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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.