Subaru OEM Spring Seat (Front) WRX / STI 2002-2007 | 20323FA000 Supra_2020-2023 Much smoother on the inside

Much smoother on the inside and with more gradual bends toward the turbo than stock for less restriction

but a common guideline is to replace it every 12

(1) Mishimoto Racing Thermostat

Use of an IGUS polymer allows for low wear and friction which leads to a long life

Easier to bleed

Subaru OEM Spring Seat (Front) WRX / STI 2002-2007 | 20323FA000 Supra_2020-2023 Much smoother on the insideProduct Fitment: 2002 2007 Subaru WRX 2004 2007 Subaru STI 20323FA000 Spring Seat Upper Front is Part Code 20323 in the diagram Warranty Disclaimer: Subaru of America will only warranty parts installed by a CERTIFIED Subaru Dealership. The part being installed must also match the vehicle VIN. IE If you install an STi block in a WRX at your friends shop, do not expect a warranty claim to come through if it explodes! Please use your best judgement.