The T25 or T28 Turbo Exhaust Inlet Gasket is a metallic crush style that is ONE TIME USE ONLY. Replace it every time you remove or upgrade your Turbo or up-pipe. A leaky Up-Pipe / turbo gasket can cause a tuner to lose their mind as the boost will not be stable or predictable and will cause the turbo to spool slower thus losing Horsepower and Torque.