When these seals wear out, they can cause leaks, sticking, and jamming of the throttle plate. We tested a car on our dyno at STM with leaky seals and when the seals were replaced, we picked up 20 whp and 20 ft pounds! Nasty boost leak! Vehicle Fitment: 1991-1994 1G DSM 1995-1999 2G DSM Evolution VIII-IX 1991-1999 3000GT & Stealth * Does NOT fit 1990 DSM * Includes: Pair of Throttle Body Shaft Seals (Optional) OEM Mitsubishi Throttle Body Gaskets 1G Notes: These do not fit 1990 DSM. They have one side that uses a smaller seal. 2G Notes: The OEM 2G throttle body gasket MD302262 has been discontinued.