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Manley Subaru EJ257 100.25mm Bore +.75mm Over Size Bore 8.5:1 CR Dish Piston Set with Rings

MAN612007C-4
807298107790
Piston Sets - Forged - 4cyl
5 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

SKU: 612007C-4 | UPC: 807298107790

Manley Subaru EJ257 100.25mm Bore +.75mm Over Size Bore 8.5:1 CR Dish Piston Set with Rings 2004-2021 WRX STI

This Manley Platinum Series piston set delivers forged strength for Subaru EJ257 engines in 2004-2021 WRX STI models. The 100.25mm bore +.75mm oversize design with 8.5:1 compression ratio dish top supports high-boost turbo builds while maintaining durability. Includes premium rings for a complete ready-to-install package trusted by engine builders.

Key Features

  • 2618-T61 Alloy Forgings: High-strength material handles extreme heat and pressure in performance applications
  • Proven Skirt Profiles: Optimized cam and barrel shapes reduce friction and wear for longer engine life
  • Tool Steel Wrist Pins: Heavy-duty pins resist fatigue in high-rpm turbocharged setups
  • Moly Skirt Coatings: Low-friction coating minimizes scuffing and improves ring seal
  • Included Rings: Premium file-fit rings ensure precise sealing and compression

Product Notes

  • Cylinder honing required to 100.25mm bore specification
  • Compression height 30.25mm rod length 130.5mm stroke 79mm
  • Set of 4 pistons weighs 1440 grams total approximately 360g each

Installation Notes

  • Professional installation recommended.
  • File-fit rings to achieve 0.003-0.004 inch end gap
  • Compatible with stock or aftermarket rods verify wrist pin fit

This Part Fits

Year Make Model Submodel
2004-2021 Subaru Impreza WRX STI
2005-2009 Subaru Legacy 2.5 GT Spec.B
2008-2014 Subaru Impreza WRX STI Hatchback
2015-2021 Subaru WRX STI Sedan

Why Choose Manley?

  • Engineers design for motorsport demands with real-world testing
  • Consistent quality from U.S. manufacturing facility
  • Backed by decades of experience in high-performance pistons

Frequently Asked Questions

  • Q: Which Subaru models use EJ257 engines for this piston set?
    A: Fits 2004-2021 Impreza WRX STI and 2005-2009 Legacy 2.5 GT Spec.B with EJ257 block confirm bore size
  • Q: What alloy and coatings are on these pistons?
    A: 2618-T61 aluminum forgings with moly skirt coating for reduced friction and tool steel wrist pins
  • Q: What preparation is needed before installation?
    A: Hone cylinders to 100.250-100.260mm file rings to spec professional balancing advised for best results

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Secure Manley box 12 x 8 x 6 inches
  • Weight: 6 lbs

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