Description
For 2004+ WRX STI (EJ257) Size (STD) Stroke (79mm) Bore (99.50mm ) SINGLE short-block builds, this Platinum Series piston listing brings the applicable Manley piston grades and dimensions together while keeping each SKU selectable at the variant level. The parent listing is distinguished by 99.50mm, which should be cross-checked against the rest of the engine combination.
Because this is a 2004+ WRX STI (EJ257) Size (STD) Stroke (79mm) Bore (99.50mm ) SINGLE 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+ WRX STI (EJ257) Size (STD) Stroke (79mm) Bore (99.50mm ) SINGLE
- Manley Series: Platinum Series
- Title Specification: 99.50mm
- 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 Numbers: Vary by selected configuration (2 SKUs in this parent family)
Available Configurations
This parent listing contains multiple selectable Manley SKUs. Choose the configuration that matches the measured engine or cylinder-head specification.
- Piston Grade: B, A
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.