As used on all Pac Performance street carsSpecially designed for the performance marketHigh flow & awesome noise suppression with minimal restriction Hand made in AustraliaBest mufflers currently on the market for performance applications, NA or TurbochargedWe've made 1000+rwhp and run into the 8s through these exact mufflers on a customers R33 Skyline street carA must for rotary street carsApplications:- Performance rotary and piston vehiclesAvailable in 2.5", 3", 3.5" or 4"