AFE Power Atlas 4" Aluminized Downpipe Back Exhaust System

2001 - 2007 6.6L GM Duramax LB7 LLY LBZ

SKU NWD-49-04001

49-04001 / 49-04001NM

The ATLAS exhaust is engineered to perform in the most extreme environments. This system is constructed from mandrel bent 4" aluminized steel tubing for maximum flow, increased horsepower, increased torque and lower EGT's.

The system is available in a 4" down-pipe back with or without muffler and is finished off with a polished tip. ATLAS exhaust systems are the perfect combination of performance, fit and value.

  • Features
  • Videos
  • Instructions
  • Vehicle Fitment

Installation is a Snap:
ATLAS exhaust systems utilized a 2-piece tailpipe design for a perfect fit by allowing adjustability at the tailpipe section. 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.

Muffler Option Features Aggressive Sound:
A free-flowing 12" 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:
ATLAS exhaust systems are constructed of 4" mandrel bent aluminized steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGT's.

Polished Tip:
Finishing off the exhaust is a high luster, polished 304 stainless steel exhaust tip. This tip features an aFe Power logo laser etched onto the top of the tip. A drain port on the bottom to keep rust and corrosion away.

Note: This is a "Race Only" product used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws.


2001 - 2004

Chevrolet / GMC Duramax

6.6L LB7

2004.5 - 2005

Chevrolet / GMC Duramax

6.6L LLY

2006 - 2007

Chevrolet / GMC Duramax

6.6L LLY / LBZ