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! Sold as the pair of seals and OEM throttle body gaskets are available in the purchase menu. Vehicle Fitment:1991-1994 1G DSM1995-1999 2G DSMEvolution VIII-IX1991-1999 3000GT & Stealth* Does NOT fit 1990 DSM *Includes:Pair of Throttle Body Shaft Seals(Optional) OEM Mitsubishi Throttle Body Gaskets1G 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, so we are unable to offer the full kit.