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Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
Manley Performance Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set
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Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set

MAN632202CE-4
807298088112
Piston Sets - Forged - 4cyl
Out of stock
$ 1,022.95 $ 941.12

SKU: 632202CE-4 | UPC: 807298088112

Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set

Upgrade your 2004 and later Subaru WRX STI EJ257 2.5L turbo engine with this Manley Platinum Series piston set featuring 99.75mm bore size (0.25mm or .010-inch oversize) and 8.5:1 compression ratio dish design. These forged pistons deliver strength for high-boost builds up to 40 psi while maintaining reliability in street and track use. Each set includes four pistons rings pins and spiro locks matched for weight and balance.

Key Features

  • 2618 T6 Alloy Forgings: High-temperature strength handles extreme boost and RPM for long-term engine life in turbocharged applications
  • Extreme Duty Skirt Profiles: Cam and barrel shapes reduce friction wear and noise with tighter clearances for responsive power delivery
  • Tool Steel Wrist Pins: 0.866 x 2.433-inch diameter pins resist fatigue and bending under high cylinder pressures
  • Moly Skirt Coatings: Graphite-moly lubrication prevents scuffing galling and cold-seize on cylinder walls
  • Precision Ring Grooves: Accommodates 1.2 1.5 2.8mm rings with accumulator groove to control blow-by and seal under boost

Product Notes

  • Compression height 30mm stroke 79mm rod length 130mm designed for stock EJ257 block and head configurations
  • Pistons weight-matched within 1 gram complete with pins at 368 grams each for easy balancing
  • Set includes Hastings or Total Seal rings pins and double spiro locks verify ring end gaps before install

Installation Notes

  • Professional installation recommended.
  • Hone cylinders to 99.75mm bore with Nikasil-compatible stones for proper clearance 0.0035-0.0045-inch
  • Compatible with OEM connecting rods upgraded H-beam rods recommended for over 500whp builds

This Part Fits

Year Make Model Submodel
2004-2007 Subaru Impreza WRX STI
2008-2014 Subaru Impreza WRX STI
2015-2021 Subaru WRX STI
2005-2009 Subaru Legacy GT Spec B

Why Choose Manley?

  • Engineered for professional tuners and racers in drag road race and rally applications
  • Forged construction proven in 1000-plus horsepower EJ257 builds worldwide
  • CNC-machined in USA with tight tolerances for consistent performance

Frequently Asked Questions

  • Q: Will these pistons fit my 2006 STI EJ257?
    A: Yes direct replacement for stock pistons in 2004-2021 EJ257 engines bore to 99.75mm for perfect fit
  • Q: What alloy and coatings are used?
    A: 2618 T6 aluminum alloy with moly-graphite skirt coating and hard-anodized dome for heat resistance and low friction
  • Q: What is the warranty and return policy?
    A: Limited lifetime warranty against manufacturing defects when installed by certified shop includes rings pins and locks

Shipping & Handling

  • Method: UPS Ground or FedEx Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Foam-protected box measures 12 x 10 x 6 inches
  • Weight: 4.2 lbs shipping weight

Request For Information

Have questions about Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston Set? Fill out the form below and we'll get back to you by the next business day.
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