aFe Large Bore-HD 4in 409 Stainless Steel Race Pipe GM Diesel Trucks 15.5-16 V8-6.6L (td) LML - 49-44067

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