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CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore 99.75mm - Size 0.25mm - CR 8.2

This CP Piston & Ring Set is engineered for the Subaru EJ257 engine found in WRX STi models, featuring a 99.75mm bore with a 0.25mm oversize and an 8.2 compression ratio. Crafted from high-strength forged aluminum, these pistons are CNC machined and balanced to within +/- 1 gram for optimal performance and durability. The set includes wrist pins and features accumulator grooves and double pin oilers force fed from the oil ring, ensuring superior lubrication and reliability under high-stress conditions.

  • High-strength forged aluminum construction
  • Super lightweight design for enhanced engine response
  • Fully CNC machined and balanced to +/- 1 gram
  • Includes wrist pins (OEM pin locks required)
  • Accumulator groove and double pin oilers for improved lubrication
  • Designed for oversized valves and high lift camshafts

These pistons provide excellent ring seal, reduced blow-by, and maintain peak horsepower throughout the life of the piston rings. Ideal for performance builds and motorsport applications for Subaru EJ257 engines.

Make Model Year Type
Subaru Impreza 2004 WRX STI
Subaru Impreza 2005 WRX STI
Subaru Impreza 2006 WRX STI
Subaru Impreza 2007 WRX STI
Subaru Impreza 2007 WRX STI Limited
Subaru Impreza 2008 WRX STI
Subaru Impreza 2009 WRX STI
Subaru Impreza 2010 WRX STI
Subaru Impreza 2010 WRX STI Special Edition
Subaru Impreza 2011 WRX STI
Subaru Impreza 2011 WRX STI Limited
Subaru Impreza 2012 WRX STI
Subaru Impreza 2012 WRX STI Limited
CP Pistons manufactures performance pistons for the Sport Compact and Domestic markets. Their manufacturing plant encompasses 32,000 square feet of CNC equipment and a climate controlled inspection department ensuring accurate and consistent quality. All pistons are made in CP’s Irvine based facility from USA made materials and are engineered for maximum power. With over 500 shelf parts available, their wide product range covers the most popular engines. Custom sizes are also available, for both sport compact and domestic vehicles.
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