The Mahle MS forged piston set for Subaru WRX 2.5L is sized to a 100.0mm bore with a 79.0mm stroke and uses a 130.4–130.5mm rod and a 23mm pin, with a -22cc dish yielding about an 8.5:1 compression ratio. Supplied as a set of four, these pistons match the dimensional and displacement specifications listed for the WRX 2.5L application and are intended for direct replacement where those measurements apply.
Mahle MS Piston Set Subaru WRX 2.5L 100mm Bore 79mm Stroke 130.4mm Rod -22cc 8.5 CR Set of 4