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Worse emissions
Thread Diameter: 0
at fast stroke speeds (i
000 rpm with this engine
and retainer
Darton Seal Tight Sleeves for Subaru EJ25 (300-031-3D) TIALBACKORDER Worse emissionsDarton Dry Seal Tight sleeves for the EJ25 Subaru WRX and STi engines replace your factory cylinder liners with a stronger, more durable and longer lasting surface that can hold more power and may be bored further than stock. A "Dry Sleeve" means that the sleeve does not contain water or coolant passages bored through the top flange. This solid design provides a more rigid structure to prevent warping and sleeve expansion. Darton cylinder head sleeves
