Manley Platinum Series Forged Piston Subaru WRX STi EJ257 99.5mm B Grade -22 cc 8.0:1

In Stock


  • 2618 high strength material; Offset wrist pin for quiet start-ups
  • .180" x 2.500" wall Premium Chrome Moly pin included P/N 42346
  • 9310 alloy .210" wall pin upgrades available P/N 42546
  • Pressure balance groove
  • Will accommodate +1mm valve sizes
  • Premium Steel top ring sets and round wire locks included
  • Recommended piston clearance: .003" for mildly boosted and .0035" for highly boosted measured 1.100" from the bottom of the oil ring.


More Information
Availability New In Stock / Available
Note Includes premium chrome moly wrist pin and round wire locks.
Item Weight 395 g
Shipping Weight (Dimensional) 1.000000
Clearance Sale No
Availability In Stock
Part Type Pistons
Make Subaru
Vehicle Model Impreza WRX STi
Model STi 04-07 GD, STi 08-14 GR, STi 15+ VA
Engine EJ257, EJ257B
Rod Length 5.137" / 130.5mm
Rod Length Oversize Standard Length
Bore Diameter 99.5mm
Bore Oversize Grade B
Stroke 79mm (Standard Stroke)
Compatible with Stock Sleeves Yes
Requires Aftermarket Sleeves No
Compression Ratio 8.0:1
Compression Ratio Range 7.0:1 - 8.0:1, 8.0:1 - 9.0:1
Pin Size 0.905" / 23mm
Included Ring Set 46995DT-1
Included Pin 42346
Head cc 57 cc
Face Type Dish
Dome cc -22 cc
Compression Height 1.209" / 30.7mm
Piston Coating Skirt Coating
Brand Manley Performance
Skirt Type Full Round
Piston Material 2618
Carb Legal Unspecified
Wrist Pin Wall Thickness 0.180"
Wrist Pin Dimensions .905" x 2.500" x .180"
Pin Material 5115 Steel


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