Mahle Motorsports Forged Piston Kit WRX/STI 92.0mm - 02-05 WRX

The MAHLE Subaru STI PowerPak is a complete, race proven piston kit composed of hand de-burred, all forged, performance coated pistons, high quality steel wrist pins, round wire locks and low drag performance piston rings.Performance coatings include a phosphate dry lubricant that is used to protect against ring micro welding and pin galling during initial start-up and engine break-in. For added performance, MAHLE applies it's proprietary "Grafal" anti-friction coating to each piston skirt.   The MAHLE WRX PowerPak was designed as a completely finished drop-in piston assembly for your Subaru WRX or STI. Other than filing the included performance ring set, everything else is done for you. * Forged from 4032 low expansion aluminum alloy for high strength and reduced piston to wall clearance* Radiused valve pockets* Forced Pin Oiling* Precision Pin Fitting and Race Proven Round Wire Locks included* 23mm high quality steel wrist pin (123 grams) included* Precision Ring Grooves for 1.2, 1.2