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Manley Performance Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings
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Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings

MAN612202C-4
807298107875
Piston Sets - Forged - 4cyl
13 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

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

Request For Information

Have questions about Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings? Fill out the form below and we'll get back to you by the next business day.
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