aFe power introduces a Large Bore-HD race pipe for 2017 Ford Diesel Trucks with V8-6.7L (td) Power Stroke engine. This system is constructed from 4" 409 stainless steel tubing for maximum flow, increased horsepower, increased torque and lower EGT's. 4" band clamps and flanges are used that offer a 360 degree sealing area. Large Bore-HD exhaust race pipes are the perfect combination of performance, fit and value.