Wiseco 2004+ Subaru EJ257 2.5L 16V WRX STI 100mm Bore 0.020 Oversize -15cc Vol 9.5 Comp - Set of 4

Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strengthArmorGlide? Skirt Coating: seizure resistant, friction reduction, and quieter operationFully machined crown featuresPrecision ring grooves, anti-detonation groove, and additional ring seal improving featuresForced pin oilingDesigned and built to withstand heavy to severe duty performance applications