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Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings
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Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings

MAN612005C-4
807298042114
Piston Sets - Forged - 4cyl
11 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

SKU: 612005C-4 | UPC: 807298042114

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings

Manley Platinum Series pistons upgrade 2004-2021 Subaru WRX STI EJ257 engines with forged strength for high-boost reliability. This set features 100mm bore (+0.5mm oversize), standard 79mm stroke, and 8.5:1 compression dish design suited to turbocharged performance. Professional builders count on these for consistent power and long-term engine life.

Key Features

  • 2618-T6 Alloy Forgings: Delivers high strength to withstand boost pressures over 40 psi and elevated temperatures in EJ257 builds
  • 8.5:1 Dish Design: -10cc volume provides ideal compression ratio for turbo setups while maintaining quench and efficiency
  • Moly Skirt Coating: Lowers friction for better ring seal, reduced scuffing, and skirt longevity under high loads
  • Tool Steel Wrist Pins: 23mm dia. x 61.9mm long, 121g weight (PN 942-2236-750-S8) ensures precise fit and durability
  • Premium Rings Included: File-fit set (1.2mm top, 1.5mm second, 2.8mm oil, PN 942-R2160-4) for immediate assembly and optimal sealing

Product Notes

  • Complete set of 4 pistons, pins, and rings. 378g piston weight with pin, 30mm compression height, 130mm rod length
  • MPN 612005C-4 designed specifically for EJ257. proven cam and barrel skirt profiles reduce noise and vibration
  • Cylinder honing required to 100mm bore. check clearances during assembly

Installation Notes

  • Professional installation recommended.
  • Machine block to 100.00mm bore diameter before install.
  • Compatible with stock 130mm connecting rods and EJ257 crank.

This Part Fits

Year Make Model Submodel
2004-2007 Subaru Impreza WRX STI
2008-2014 Subaru Impreza WRX STI
2007, 2011-2014 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2015-2021 Subaru WRX STI

Why Choose Manley?

  • Relied on by pro engine builders and tuners for EJ257 race and street engines
  • Field-tested durability in high-horsepower Subaru applications
  • CNC-machined precision for tight tolerances and repeatable results

Frequently Asked Questions

  • Q: Do these fit 2015-2021 WRX STI models?
    A: Yes, direct fit for all 2004-2021 EJ257-equipped WRX STI with block machined to 100mm bore
  • Q: What alloy and coatings are used?
    A: 2618-T6 forged alloy with moly skirt coating, Accumulator Groove, and reverse face rings for boosted durability
  • Q: What warranty coverage?
    A: Backed by Manley warranty against manufacturing defects when installed by qualified technicians

Shipping & Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Manley box 11.1 x 11.1 x 2.6 inches
  • Weight: 3.2 lbs

Request For Information

Have questions about Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish 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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