AFE 49-44059 Large Bore HD 4" Downpipe-Back Exhaust System

Product Description

Fits: 2001-2010 GM 6.6L Duramax (Crew & Ext. Cabs)

The AFE 49-44059 Large Bore HD 4" Downpipe-Back Exhaust System for your 2001-2010 GM 6.6L Duramax is engineered to perform in the most extreme environments. This system is constructed from 4" mandrel bent stainless steel tubing for maximum flow increased horsepower, increased torque and lower EGT’s. This system uses high quality band clamps, OE-style bayonet hangers and includes an adjustable hanger clamp for a tight secure fitment. This system is includes a free-flowing 24" long muffler and includes your choice of a 6" diameter polished stainless steel or black coated clamp-on exhaust tip.
Installation is a Snap:
This Large Bore HD System Includes an extension pipe and an adjustable hanger for a perfect fit. This kit uses factory mounting locations providing stability and hassle-free installation.
Leak-Free Seal:
High quality OE style flange and band clamps are used for a complete 360 degree sealing surface.
Aggressive Sound:
A free-flowing 24" long muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque out of your rig.
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 Large Bore HD exhaust system is constructed of 4" mandrel bent stainless steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGT’s.


  • Adjustable Hanger To Fit 2001-2010 Models
  • 4" Mandrel-Bent Stainless Steel Construction
  • Your Choice Of 6" Polished Or Black Exhaust Tip
  • Free-Flowing 24" Muffler For Deep, Powerful Sound
  • Uses Factory Mounting Locations For Hassle-Free Installation
Fitment Note: Fits Crew Cab/Short Bed, Crew Cab Long Bed, Extended Cab/Short Bed, & Extended Cab/Long Bed
Warning: On 2007.5-2010 models, this free-flowing race exhaust requires the use of an aftermarket performance programmer with off-road tuning.
$ 549.00