Subaru CP Pistons STI Pistons for WRX EJ257

CP STI Piston Standard features include:

• Deep valve reliefs accommodate high lift camshafts
• Larger valve reliefs for +1mm valve sizes
• Custom skirt cam and barrel design
• Accumulator grooves
• High strength aluminum forgings
• High performance rings included

• Fully CNC machined and balanced to +/- 1 gram
• Wrist pins included at no additional cost
• Double pin oilers force fed from oil ring groove
• Pick lock grooves for easy lock removal
• Pin fitting included

CP Pistons Subaru WRX Pistons and Ring Sets

For use in WRX STI and EJ257 engine equipped cars.

• Bore Size Cylinder bore size piston is designed to work in, listed in inches and millimeters
• Relative Size Denotes whether this bore size is stock standard size, or an oversize listed in millimeters
• CR Compression Ratio
• Crankshaft Stroke Crank stroke the pistons are designed to work with. The stock stroke length is 79mm.
• Connecting Rod Length Designed to work with stock connecting rod length of 130.5mm
• Wrist Pin Diameter 23mm
• Compression Height This is the distance from the centerline of the wrist pin bore to the top flat surface of the piston.
• Ring Widths Ring grooves are machined to work with 1.0mm, 1.2mm, 2.8mm rings
• WHAT’S INCLUDED 4 forged pistons, 4 Wrist Pins, pin retention locks and premium piston ring set

Our complete listing of all available CP Carrillo Pistons is on our site here CP Carrillo Forged Racing Pistons