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Part #:

AFE 49-44017 Mach Force XP 4" Down-Pipe Back Race Exhaust System

2007.5-2010 GM 6.6L Duramax LMM (All Cabs & Beds)
Part #:
FROM 584.25
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The AFE 49-44017 Mach Force XP 4" Down-Pipe Back Race Exhaust System for your 2007.5-2010 GM 6.6L Duramax is engineered to perform in the most extreme environments. This system is constructed from mandrel bent 4" stainless steel tubing for maximum flow, increased horsepower, increased torque and lower EGTs. The system is available in a 4" down-pipe back with muffler and is finished off with a powder-coated black or polished tip. Mach FORCE XP exhaust systems are the perfect combination of performance, fit and value.

Installation is a Snap:
All systems use factory mounting locations providing stability and a 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" x 8" 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 Fitment:

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

Flow and Performance:

Mach FORCE XP exhaust systems 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.

Exhaust Tip:
Finishing off the exhaust is a polished or powder-coated black 304 stainless steel exhaust tip. This tip features a drain port on the bottom to keep rust and corrosion away. A unique stainless steel laser-cut aFe Power logo plate is riveted on for an aggressive style.


  • Down-Pipe Back
  • 4" T409 Stainless Steel Construction
  • Stainless Steel Band Clamps
  • Bayonet OE-Style Welded On Hangers
  • Free Flowing Muffler
  • Black Or Polished Exhaust Tip

Exhaust Tip Finish
Polished 49-44017-P
Black 49-44017-B

Warning: This free-flow race exhaust system requires the use of an aftermarket performance programmer with off-road tuning. Does not fit Cab & Chassis models.


  • Manufacturer Name AFE
  • Shipping Weight 65.00 lb.
  • Shipping Length 14 in.
  • Shipping Width 60 in.
  • Shipping Height 19 in.
  • 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

Is the AFE AFE49-44017-P exhaust compatable with the AFE Down pipe? Loking to put a DPF delete exhaust system on my 2008 GMC Duramax. I would like to use the 4" AFE system AFE49-44017-P stainless with the AFE down pipe but concerned about the size in diameter difference. Is this an issue? Will the two hook together?
View Staff Answer 
The AFE49-44017-P works perfectly with the AFE Down-Pipe 49-44034.
Is the AFE49-44017-P for crew cab long box?
View Staff Answer 
The AFE49-44017 exhaust system is designed to work on all cab and bed configurations for the 07.5-10 GM 6.6L Duramax LMM.
Is there a quiet factory style muffler available. 2010 3500hd crew cab long box?
View Staff Answer 

The AFE 49-44017 MACH FORCE XP 4" DOWN-PIPE BACK RACE EXHAUST SYSTEM will have a relatively quite muffler. That in combination with the factory VGT turbocharger will not increase the exhaust sound to a point where it is too excessive.

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.