Wiseco Subaru WRX 4v R/Dome 8.4:1 CR 92mm Piston Shelf Stock KitProfessional Series forged racing pistons from Wiseco are no expense spared pistons designed for the serious racers and builders. Packed full of custom level performance and durability features and provided with premium rings, Professional Series pistons are designed and built for use in heavy to severe duty race builds. Remove your limits with Wiseco? s Professional Series. This Part Fits: Year Make Model Submodel 2009 2010 Subaru Impreza 2. 5 GT