Description: 2-1 chrome slip on with Heat shields. Long to the collector, which means it will make more high RPM power at the lower RPM's expense. This is a "Diffuser Disc" system that is adjustable [ Back Pressure ] The Muffler section is a bit large and will scrape fairly easy. Some have complained that exhaust "Soots Up" their wheel/brake rotor. I like this pipe for high RPM power. You will need a PowerCommander or TFI [ Race Fueler ] or Race Tuner to make this pipe work.