AFE 49-44045-1B Large Bore-HD 4" 409 Stainless Down-pipe Back Exhaust System w/ Black Tip | 02-04 GM 6.6L Duramax

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  • 4" 409 Stainless Exhaust
  • Black Tips Included
  • Muffler Included

AFE 49-44045-1B Large Bore-HD 4" 409 Stainless Down-pipe Back Exhaust System w/ Black Tip | 02-04 GM 6.6L Duramax


Warning: This product can expose you to chemicals that are known to the State of California to cause cancer. For more information, visit

Increased exhaust flow means improved torque, horsepower and lower EGT’s. That’s why your Duramax diesel needs the Large Bore Dual Side Exit down-pipe back exhaust system by aFe Power. This exhaust is built from 4" mandrel-bent 409 stainless steel tubing, including 2 massive 6" Black powder coated exhaust tips and a 24" Long muffler for optimum flow and an aggressive sound and looks. Large Bore exhaust systems are the perfect combination of performance, fit and value.

Installation is a Snap:

  • This Large Bore exhaust system includes an extension pipe to fit multiple cab configuration and uses factory mounting locations, providing stability and hassle-free installation.

Leak-Free Seal:

  • Quality OE style flange and band clamps are used for a complete 360 degree sealing surface.

Massive 6" Black Tips:

  • Finishing off this Large Bore exhaust are dual powder-coated high temp black 304 stainless steel exhaust tips. The tips feature a drain port on the bottom to keep rust and corrosion away. Unique stainless steel laser-cut aFe Power logo plate are riveted on for an aggressive style.

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.

Fits With Spare Tire:

  • This exhaust system fits perfectly without removing the spare tire.

OE Fit:

  • OE style bayonet hangers are used to maintain a stable pipe location during high vibration and high heat conditions. The bayonet tip locks into the hanger bushing for an OE style fit that does not change with time.

Flow and Performance:

  • Constructed of 4" mandrel bent 409 stainless steel tubing for longevity, the smooth transition bends result in increased exhaust flow and lower EGT's for improved throttle response and overall sound and performance.


  • Extended Cab/Short Bed, 6.6 ft. Bed, 143.5" Wheelbase

  • Crew Cab/Short Bed, 6.6 ft. Bed, 153" Wheelbase

  • Extended Cab/Long Bed, 8 ft. Bed, 157.5" Wheelbase

  • Crew Cab/Long Bed, 8 ft. Bed, 167.1" Wheelbase

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