AFE 49-14017NM Large Bore HD Down-Pipe Back No Muffler Exhaust System

2007.5-2010 GM 6.6L Duramax LMM
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The LARGE Bore HD exhaust 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 EGT’s. The system is available in a 4" down-pipe back without muffler. LARGE Bore HD 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 muffler-delete pipe is used for a true race-inspired sound and maximum flow.

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:
LARGE Bore HD 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 EGT’s.

  • 4" T409 Stainless Steel
  • No Muffler, No Tip 
  • Down-Pipe Back
  • OE-Style Flange
  • No Bungs
  • Limited 2-Year Warranty

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

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