BBK 1565 2-1/2" High Flow Performance Full Off-Road H-Pipe for Ford Mustang GT 4.6L-2V BBK is your number one aftermarket performance exhaust brand in the USA - American designed and built BBK exhaust is built with CNC mandrel bent tubing for 35 percent increased flow over stock to increase horsepower, torque and performance 2.5 inch full length hi flow off road race only h pipe fits all stock and aftermarket shorty exhaust headers Bolt on additional 12-20 horsepower and more aggressive sound, oem style dome connections for easy fitment