CP Pistons & Rings Bore 100.5mm Size +1.0mm CR 8:2 Subaru WRX / STI EJ257 Turbo Models 2004-2021

CP WRX and 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.

CP Pistons Subaru piston and ring kits are as good as they come. Founded to service the needs of those with the desire to build engines of the highest quality and technology, CP Pistons uses proprietary tooling, dedicated cutters, unique fixtures, and state-of-the-art equipment to produce superior pistons that won't compromise your expectations. Their climate-controlled inspection department is the most advanced in the industry—and is outfitted with computerized electronic equipment specifically designed for their needs. Each piston is engineered using sophisticated computer modeling for optimum designs, while their 5-axis machining capability enables them to create any piston for any application.

• High-strength aluminum forgings
• Super lightweight design
• Fully CNC machined and balanced to +/- 1 gram
• Accumulator groove included
• Double pin oilers, force fed from oil ring
• Includes Wrist Pins
• Actual Product May Vary from Image

Additional notes and/or kit features:

• Some pistons are suitable for turbo, nitrous oxide, and supercharged engines
• Available in standard or oversized
• Deep valve relief depth accommodates high-lift camshaft
• Made for +1mm valve sizes
• Custom skirt cam and barrel design
• Accumulator grooves
• High-strength aluminum forgings
• High performance rings
• Can be compatible with oversized valves, higher lift cams, and high-performance rings
• Fully CNC-machined and balanced to +/-1 gram
• Wrist pins included at no additional cost
• Double pin oilers, force-fed oil ring
• Pick lock grooves for easy lock removal
• Pin fitting included