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Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Manley Performance Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
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Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)

MAN612200CB-1
807298107837
Pistons - Forged - Single
2 Units In Stock - Ships Next Business Day
$ 216.97 $ 199.61
$ 199.61

SKU: 612200CB-1 | UPC: 807298107837

Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston for 2004-2021 WRX STI (Single Piston)

Manley Platinum Series pistons deliver reliable performance for Subaru EJ257 2.5L turbo engines in 2004-2021 WRX STI models. This single piston offers 99.5mm Grade B bore sizing and -17cc dish volume for 8.5:1 compression ratio with stock 60cc heads. Ideal for high-boost builds with proven 2618 alloy construction and moly skirt coatings.

Key Features

  • 2618-T6 Forged Aluminum: High-tensile alloy withstands extreme boost pressures and heat in turbocharged EJ257 applications
  • 99.5mm Grade B Bore -17cc Dish: Precision sized for STI blocks delivering 8.5:1 compression ratio on pump gas setups
  • Moly Skirt Coating: Minimizes friction galling and scuffing for smoother operation and extended service life
  • Tool Steel Wrist Pin: Heavy-duty 23mm x 39.7mm pin rated for high-rpm loads with 122g weight
  • Optimized Skirt and Cam Profiles: Ensures proper piston-to-wall clearance quiet running and balanced dynamics

Product Notes

  • Sold as single piston. purchase four for complete STI engine rebuild
  • Includes performance ring pack: 1.2mm/1.5mm/2.8mm sizes with moly top ring
  • Compression height 30mm suits 79mm stroke and 130.5mm rods

Installation Notes

  • Professional installation recommended.
  • Hone cylinders to 99.5mm Grade B specifications before install
  • Uses standard STI connecting rods. balance assembly required

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?

  • Relied on by professional engine builders and tuners worldwide
  • Track-proven durability in racing and street performance
  • Precision CNC-machined components for exact fitment and balance

Frequently Asked Questions

  • Q: Does this fit all EJ257 STI engines?
    A: Yes fits 2004-2021 Subaru WRX STI models with EJ257 2.5L turbo engines stock bore refreshed blocks
  • Q: What is the piston weight and material?
    A: 392 grams forged 2618-T6 aluminum alloy with 392g piston weight excluding 122g pin
  • Q: Are rings and wrist pin included?
    A: Yes includes tool steel wrist pin and complete ring set pre-gapped for 99.5mm bore

Shipping & Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Individual protective box 6 x 6 x 4 inches
  • Weight: 0.90 lbs

Request For Information

Have questions about Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)? Fill out the form below and we'll get back to you by the next business day.
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