Engines and Components› Pistons and Piston Rings
CP Pistons
CP Piston & Ring for Subaru EJ257 WRX STi - Bore (99.75mm) - Size (0.25mm) - CR (8.2) SINGLE PISTON
SKU: C00A SC7422-1
Advanced — 4+ hours
Description
They include deep valve relief to accommodate high lift camshafts and are made for +1mm valve sizes. The custom skirt design is cam and barrel, and the pistons are fully CNC machined and balanced to +/- 1 gram. Wrist pins and pin fitting are included, as are pick lock grooves for easy lock removal.
Fitment
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Specifications
| Brand | CP Pistons |
| Part Number | C00A SC7422-1 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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