RCM / Omega Piston Set - High Compression WRX & STI 2006-2013 (V9+) EJ25 Size:99.75mm Oversize will need to be purchased

will need to be purchased separately

it has an extra x1 thou of skirt clearance for high load / power applications

comes with bolts

Our kit retains the standard pulley diameters which allow the use of the existing auxiliary drive belt to ensure power steering and alternator speeds remain standard

This 3 port water pump

RCM / Omega Piston Set - High Compression WRX & STI 2006-2013 (V9+) EJ25 Size:99.75mm Oversize will need to be purchasedRCM have always chosen Omega as their preferred piston manufacturer, not only because of their extensive experience within motorsport but also for the incredible accuracy and attention to detail that is applied to every aspect of their manufacturing. So why forged? A forging is still the best way to manufacture a piston, not just from a production point of view but for the strength of the piston. There are certain areas where a piston machined from