SKU: 612202C-4 | UPC: 807298107875
Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings 2004-2021 WRX STI
Upgrade your Subaru EJ257 2.5L turbo engine with this Manley Platinum Series piston set designed for 2004-2021 WRX STI models. The 99.75mm bore (+.25mm oversize) and 8.5:1 dish configuration support high-boost applications while maintaining reliability. Each set includes premium rings for a complete, balanced assembly ready for professional engine builds.
Key Features
- 2618 T6 Alloy Forgings: High-temperature aluminum alloy provides strength to withstand extreme boost pressures and RPMs in turbocharged EJ257 engines
- Optimized Skirt Profiles: Proven cam and barrel skirt designs minimize friction, reduce wear, and ensure quiet operation under load
- Tool Steel Wrist Pins: Heavy-duty 21mm x 63mm pins with wire locks deliver secure rod connection and long-term durability
- Moly Skirt Coating: Applied to select surfaces to prevent scuffing, galling, and cylinder wall damage during break-in and operation
- Premium Ring Pack Included: Steel top ring, ductile iron second ring, and three-piece oil ring set with pre-gapped rings for exact 99.75mm bore fit
Product Notes
- Bore engine block to 99.75mm (3.928 inches) prior to installation
- Pistons balanced as a matched set of four to 388 grams each
- Ships in protective Manley packaging for damage-free delivery
Installation Notes
- Professional installation recommended.
- Requires cylinder honing to 99.75mm with 45-degree crosshatch pattern
- Compatible with stock EJ257 connecting rods (130mm length) and 79mm stroke crankshaft
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2007 | Subaru | Impreza WRX STI | All (EJ257) |
| 2008-2014 | Subaru | Impreza WRX STI | All (EJ257) |
| 2015-2021 | Subaru | WRX STI | All (EJ257) |
Why Choose Manley?
- Engine builders and tuners select Manley for consistent results in competition engines
- Forged construction handles 40+ psi boost levels with repeated dyno passes
- Precision machining includes 30mm compression height for exact deck clearance
Frequently Asked Questions
- Q: Which Subaru models use the EJ257 engine for this piston set?
A: Fits all 2004-2021 WRX STI models equipped with the EJ257 2.5L DOHC turbo engine including hatchback and sedan variants - Q: What alloy and coatings are used on these pistons?
A: Made from 2618 T6 aluminum alloy forgings with moly skirt coating, accumulator grooves, and nickel wrist pin bores for heat resistance - Q: What is included and any warranty details?
A: Complete set of 4 pistons, rings, wrist pins, and locks included. backed by Manley limited warranty against manufacturing defects
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock – ships same or next business day
- Packaging: Manley branded box 12in x 10in x 6in
- Weight: 5 lbs
Reviews
There are no reviews yet.