Description
Manley developed this Platinum Series piston configuration for 2004+ Subaru WRX STI (EJ257) 75mm DE - STROKED; 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 99.5mm / 9.8:1, which should be cross-checked against the rest of the engine combination.
Because this is a 2004+ Subaru WRX STI (EJ257) 75mm DE - STROKED piston family, final fitment depends on the machine shop’s finished cylinder measurement and the intended rod/stroke combination—not simply on nominal engine displacement.
Key Product Details
- Application: 2004+ Subaru WRX STI (EJ257) 75mm DE - STROKED
- Manley Series: Platinum Series
- Title Specification: 99.5mm / 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: 621100C-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
Confirm finished bore size, required piston grade, compression ratio, compression height, pin specification, ring package, and piston-to-wall clearance with your machine shop or engine builder.
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.