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Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set
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Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set

MAN632205CE-4
807298088136
Piston Sets - Forged - 4cyl
5 Units In Stock - Ships Next Business Day
$ 1,022.95 $ 941.12
$ 941.12

SKU: 632205CE-4 | UPC: 807298088136

Manley 04+ Subaru WRX/STI EH257 100.0mm Bore +.50mm Size 8.5:1 Dish Extreme Duty Piston Set

Manley Extreme Duty piston set delivers forged performance for 2004 and later Subaru WRX and STI models equipped with EJ257 2.5L turbo engines. This Platinum Series kit features 100.5mm bore sizing with 8.5:1 compression ratio ideal for high boost turbo builds handling up to 1000+ horsepower. Engine builders choose these pistons for reliable power gains and long term durability in racing and street applications.

Key Features

  • Forged 2618-T6 Alloy: Aerospace grade material resists detonation and high cylinder pressures in boosted setups
  • 8.5cc Dish Design: Lowers compression to 8.5:1 perfect for aggressive turbocharging and nitrous use
  • Tool Steel Wrist Pins: H13 hardened pins measure 22mm diameter x 50.8mm length rated for extreme RPM and load
  • Moly Phosphate Skirt Coating: Reduces scuffing friction and galling during break-in and high heat operation
  • Precision Skirt Profiles: Optimized cam and barrel shapes control piston rock for quieter operation and better ring seal

Product Notes

  • Set of 4 pistons complete with pins and rings 1.2mm/1.5mm/2.8mm sizes
  • Compression height 30mm stroke 79mm rod 130.5mm assembled weight 503 grams per piston
  • Accumulator groove above top ring prevents flutter under high boost

Installation Notes

  • Professional installation recommended.
  • Bore cylinders to 100.500-100.515mm clearanced for rings hone to Ra 15-20 microinch
  • Includes pins fits OEM or ARP rod small end use moly assembly lube

This Part Fits

Year Make Model Submodel
2004-2007 Subaru Impreza WRX STI
2008-2014 Subaru Impreza WRX STI
2015-2021 Subaru WRX STI

Why Choose Manley?

  • Engine builders and tuners trust Manley for championship winning engines
  • Hand assembled and inspected in USA facility
  • Extensive dyno and track testing backs every set

Frequently Asked Questions

  • Q: Does this piston set fit all EJ257 engines in 2004+ STI models?
    A: Yes fits every USDM Subaru STI EJ257 from 2004-2021 verify your bore needs oversize machining
  • Q: What alloy and coatings are used?
    A: 2618-T6 forged aluminum with moly phosphate skirts and ceramic top ring grooves for heat resistance
  • Q: Are rings pins included warranty details?
    A: Complete set includes rings and H13 pins contact Manley for warranty on manufacturing defects

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Foam protected custom box 12 x 12 x 6 inches
  • Weight: 5.4 lbs

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