The AFE 49-14003NM Large Bore HD 4" Downpipe-Back Exhaust (No Muffler) for the 2001-2004 GM 6.6L Duramax is engineered to perform in the most extreme environments. Constructed from precision, mandrel bent 4” 409 stainless steel tubing the large diameter tube and smooth transitions are specifically designed for maximum flow, increased horsepower, increased torque and lower EGTs. To provide a leak-free seal, OE style band clamps are used that offer a 360º sealing area vs. cheap U-bolt clamps used in other systems. 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.
High quality OE-style flange and band clamps are used for a complete 360 degree sealing surface.
A muffler-delete pipe is used for a true race-inspired sound and maximum flow.
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 EGTs.
- 4” Mandrel Bent 409 Stainless Steel
- Muffler Delete
- OE-Style Band Clamps for Leak Free Seal
- Hassle Free Installation
- Made in the USA
Tip Not Included
2001-2004 GM 6.6L Duramax (All Cabs & Beds)