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The Wiseco piston set listed for Subaru WRX EJ20 stroker builds (92.50 mm bore) is a shelf stock four‑piston kit intended for modified short‑stroke assemblies. From Wiseco’s Professional Series pedigree, these pistons emphasize machining precision, forced pin oiling and protective skirt treatment to help reduce friction and support ring sealing in higher‑stress stroked EJ20 engines.
Wiseco Subaru WRX EJ20 STROKER 1.181CH Piston Shelf Stock Kit
