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Part #: AFE49-04059

AFE 49-04059 ATLAS 4" Downpipe-Back Exhaust System

2001-2010 GM 6.6L Duramax (Crew & Ext. Cabs)
Part #: AFE49-04059
$444.59 $ $400.13
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The AFE 49-04059 ATLAS 4" Downpipe-Back Exhaust System for your 2001-2010 GM 6.6L Duramax features a 4" mandrel-bent aluminized steel construction for maximum flow, increased horsepower, 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 unit is available with a free-flowing aluminized muffler and uses all factory mounting locations this provides for a quick, hassle-free installation. ATLAS exhaust systems are the perfect combination of performance, fit and value. Exhaust tip not included. 

Installation is a Snap:
This Atlas 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.

Aluminized Muffler
A free-flowing aluminized muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque out of your rig.

Leak-Free Seal:
High quality OE-style flange and band clamps are used for a complete 360 degree sealing surface.

Flow and Performance:
This ATLAS exhaust system is constructed of 4" mandrel-bent aluminized steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGTs.

OE Fitment:
OE-style hangers with bayonet tip are used to maintain a stable pipe location during high vibration and high heat conditions.


  • Turbo-Back Race Exhaust
  • 4" Mandrel-Bent Aluminized Construction
  • Aluminized Free-Flowing Performance Muffler 
  • Adjustable Hanger To Cover All Models From 2001-2010
  • Uses Factory Mounting Points For A 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. 


  • MFG. Number 49-04059
  • Manufacturer Name AFE
  • Shipping Weight 76.00 lb.
  • Shipping Length 60 in.
  • Shipping Width 14 in.
  • Shipping Height 19 in.
  • Diameter 4"
  • Exhaust Exit Single
  • Exhaust Type Downpipe-Back
  • Material Aluminized Steel
  • UPC 802959492543
  • Warranty Yes
  • Warranty Info 2 Year
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Questions and Answers

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Most Popular Questions

Does this kit come with a clamp to clamp down pipe to turbo pipe?
View Staff Answer 
No, the system will only include the clamps to hold the system component together. Your OEM clamps on the downpipe are reused.
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.