CP High Performance Pistons | Multiple Subaru Fitments (SC7426)

CP High Performance Pistons

CP pistons are compatible with oversized valves and high lift camshafts. Part numbers ending in a “X” are on a X-style forging for additional strength, durability and weight reduction. The X-style has a full radius dome design, high performance rings and light weight wrist pins. CP Pistons represent the highest quality and is engineered for maximum power. Pistons can be ordered with gas ports, skirt coating, ceramic top coating, and stronger wrist pins if desired.

Features

• 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
• Fully CNC machined and balanced to +/- 1 gram
• Wrist pins included
• Double pin oilers force fed from oil ring groove
• Pin lock grooves for easy lock removal
• Pin fitting included

Applications

• 2004-2007 Subaru STi EJ257

Specifications

• Bore: 99.75mm
• Size: +0.25mm
• CR: 9.0