aFe Large Bore-HD 4 IN 409 Stainless Steel Down-Pipe Back Exhaust System GM Diesel Trucks 01-07 V8-6.6L (td) LB7/LLY/LBZ - 49-14003NM

The LARGE Bore HD exhaust is engineered to perform in the most extreme environments. This system is constructed from mandrel bent 4 in. stainless steel tubing for maximum flow, increased horsepower, increased torque and lower EGT's. The system is available in a 4 in. down-pipe back without muffler. LARGE Bore HD exhaust systems are the perfect combination of performance, fit and value. 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, stat and federal laws.