CP 99.5 Bore 9.0:1 Piston Set

2006-2014 Subaru WRX / 2004-2021 Subaru STI

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SKU: SC7425We price match!

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  • 99.5 Bore  with a 9.0:1 compression ratio
  • Forged construction
  • Ideal for those building a high boosted motor or for those who need to sustain racing conditions
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CP 99.5 Bore 9.0:1 Piston Set 


  • 99.5mm bore
  • 9.0:1 Compression ratio
  • 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
  • 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



The CP Piston Set features forged construction to sustain more boost and more power in your EJ. Just like any turbocharged engine, the EJ has a limit. Once you surpass those limits the internals will let go, including the pistons. CP has established its brand as one of the most trusted piston companies in the industry and is utilized in some of the most powerful race cars on a worldwide scale. If you want to turn the boost up on your high-powered street car, or if you want to build a motor to survive in your purpose-built race car, you will be pleased with the quality and the performance of CP Pistons. 

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