Subaru OEM Type RA Piston - 99.5mm "A" STI 2018-2021 | 12006AE550 check This closed-loop system routes clean

This closed-loop system routes clean filtered air back in through the engine promoting negative crankcase pressure for optimal performance

Exterior Sound Profile - Aggressive

Part #: 4648S

GLASS WOOL The long fiber wool threads were adopted for the silencer

Part #: 2220

Subaru OEM Type RA Piston - 99.5mm "A" STI 2018-2021 | 12006AE550 check This closed-loop system routes cleanProduct Fitment: 2018 2021 STI These are the OEM pistons that come in the factory EJ257 Type RA Short Block. **This includes pistons, wrist pin and circlips, and each piston is sold individually.** Rings are sold separately. 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