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Support & Order
CP Standard Shelf Pistons Features
Dedicated forgings
Balanced to + or 1 gram
Wrist pins provided at no cost
Pin fitting provided at no cost
Accumulator Grooves
Dual forced pin oilers
Pick lock grooves
Fully CNC machined
USA Made
Make: Subaru
Model: Impreza WRX STi
Engine: EJ257 + 83mm Stroker
Compression Ratio: 8.5:1
Pin Size: 23mm
Compression Height: 1.123
Rod Length: 130.5mm
Stroke: 83
Bore: 99.5mm
Material: 2982 Alloy
Bore Size: STD
Standard Pin (Included): 905-2500-18CP1S
Upgraded Pin (Not Included): 0.200" Wall: 905-2500-20CP3S or 0.260" Wall: 905-2500-26CP3S
Pin Locks (Included): None
Ring Part#: RS1658-3917-0
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