STM High Pressure Throttle Body Shaft Seals.
- Evolution VIII-IX
- 1991-1999 3000GT & Stealth Twin Turbo
- 1991-1994 1G DSM
- 1995-1999 2G DSM
**These do not fit 1990 DSM: they have one side that uses a smaller seal.
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 OEM leaky seals...
When the seals were replaced, we picked up 20 whp and 20 ft pounds! Incredible Boost Leak!
OEM throttle body gaskets are available in the drop down.
Sold as a pair of seals.