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Part #: AFE49-04054NM

AFE 49-04054NM ATLAS 5" Down-Pipe Back No Muffler Race Exhaust System

2015.5-2016 GM 6.6L Duramax LML (133.7" to 167.7" Wheelbase)
Part #: AFE49-04054NM
  1 Review
$567.14 $ $510.43
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The AFE 49-04054NM ATLAS 5" Down-Pipe Back No Muffler Race Exhaust System for your 2015.5-2016 GM 6.6L Duramax is built and engineered to performance in the most extreme environments. This off-road race exhaust system is constructed from mandrel bent 5" aluminized steel tubing for maximum flow, increased horsepower, increased torque and lower EGTs. This system is available in 5" down-pipe back without muffler. ATLAS exhaust systems are the perfect combination of performance, fit and value.
Installation is a Snap:
ATLAS exhaust systems utilize 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 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 muffler delete-pipe is used for a true race-inspired sound and maximum flow.
Perfect 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:
ATLAS exhaust systems are constructed of 5" mandrel bent aluminized steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower, torque and lowering EGTs.

  • 5" Aluminized Steel Construction
  • Down-Pipe Back Race Exhaust
  • No Muffler
  • No Tip 

Warning: This free-flow race exhaust system requires the use of an aftermarket performance programmer with off-road tuning.

Fitment Note: These kits will only fit models manufactured after July 2014 equipped with a flanged down pipe. Does not fit cab & chassis, Fits 133.7" to 167.7" wheel bases only.



  • MFG. Number 49-04054NM
  • Manufacturer Name AFE
  • Shipping Weight 82.00 lb.
  • Shipping Length 60 in.
  • Shipping Width 14 in.
  • Shipping Height 19 in.
  • Diameter 5"
  • Exhaust Exit Single
  • Exhaust Type Downpipe-Back
  • Material Aluminized Steel
  • UPC 802959492420
  • Warranty Yes
  • Warranty Info 2 Year
  • Prop 65 WARNING: Cancer & Reproductive Harm -


cool sounds from this kit, BUT
Location: nation wide
sounds cool around town. Cruising at 65 mph rpms up hills, crazy drone. Towing around same rpms as cruising 65 mph, HOLY DRONE. I COULDN'T EVEN USE MY BLUETOOTH NOR TALK DIRECTLY ON MY PHONE. going to 4 inch with quiet muff.

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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.