Description
Manley developed this Platinum Series piston configuration for Subaru WRX STI (EJ257) 99.75mm +; use the listed bore and compression details to match the piston to the finished cylinder and intended rotating assembly. The parent listing is distinguished by 25mm / 9.8:1, which should be cross-checked against the rest of the engine combination.
For Subaru WRX STI (EJ257) 99.75mm + builds, piston grade and bore size should be treated as measured engine-build specifications. Confirm the matching cylinder and any required piston-to-wall clearance before assembly.
Key Product Details
- Application: Subaru WRX STI (EJ257) 99.75mm +
- Manley Series: Platinum Series
- Title Specification: 25mm / 9.8:1
- Product Family Detail: 2618-alloy forged piston construction
- Product Family Detail: tool-steel wrist-pin hardware on applicable part numbers
- Product Family Detail: moly skirt coating on applicable part numbers
- Manufacturer Part Number: 632302C-1
Package Quantity
Sold individually. This listing supplies one piston per selected SKU; order the quantity required for your engine and verify that all pistons match the machine shop’s bore/grade plan. This quantity applies to the selected Manley SKU family shown on this product page.
Selection & Fitment Notes
Piston selection should follow the measured finished bore and complete rotating-assembly specification. Do not choose a grade or oversize solely because it appears to fit the engine family.
Professional engine assembly and measurement are recommended. Product specifications should be confirmed against the selected Manley part number and the requirements of the exact engine build.