Manley forged stroker pistons for the 02-05 WRX are machined of high strength 2618 material. Each design is lightweight yet
robust enough to deliver long service life. Round wire locks, tool steel wrist
pins and piston rings are included with every set at no additional charge. A
proprietary multi-step top ring groove machining process assures optimum
control of the groove's size, geometry, flatness and finish. Precise pinhole
machining results in an exact compression distance as well as precise lock ring
groove spacing, size and concentricity. Manley pistons are available in
standard size as well as a wide variety of oversize/overbore options to
accommodate any high performance engine build.
Each set of pistons comes complete with forged pistons, rings, wrist pins and pin locks.