JE Pistons SUB STI EJ257 Block w/ EJ20 Head 100mm Bore CR 8.5 KIT Set of 4 Pistons

Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applicationsDesigned specifically for each engine and use application to provide optimized performance durabilityProprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pinSkirt coating (depending on application) reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noiseAccumulator groove (depending on application) helps reduce pressure from combustion gases, reducing ring fluttering and improving ring seal for consistent powerIncludes high-quality wrist pins, locks, and JE Pro Seal premium piston ringsMade 100% in the USAThis Part Fits: Year Make Model Submodel 2006-2008 Subaru Impreza 2.5i 2002-2004 Subaru Impreza Outback 2005-2008 Subaru Impreza Outback Sport 2002-2005 Subaru Impreza RS 2002-2004 Subaru Impreza TS 2002-2008 Subaru Impreza WRX 2006-2007 Subaru Impreza WRX Limited 2004-2008 Subaru Impreza WRX STI 2007 Subaru Impreza WRX STI Limited 2006-2007 Subaru Impreza WRX TR