CP Pistons Subaru EJ257 WRX STi - Bore (99.75mm) SC7422-4

CP WRX STI forged pistons feature superb ring seal, higher vacuum, lower blow-by, greater durability and increased horsepower and torque through the power band. Better yet, peak horsepower is retained through the life of the piston rings. This is achieved by lightweight forgings and CP's exclusive machining techniques and processes. CP's commitment to racing is reflected in every piston they produce.

Bore Diameter: 99.75mm
Pin Size: -0.905in / 23mm
Stroke: 79mm
Rod Length: 5.137in / 130.5mm

Part# SC7422-4 

CP PISTON FEATURES:

• High-strength aluminum forgings
• Super lightweight design
• Fully CNC machined and balanced to +/- 1 gram
• Include wrist pins
• Accumulator groove included
• Double pin oilers, force fed from oil ring