CP Piston Set 99.5mm Bore 8.2:1 CR

2015-2021 Subaru STI

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SKU: SC7420We price match!

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The 99.5mm Bore 8.2:1 CR Forged Pistons will allow the Subaru STI to run more power and more boost.
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CP Piston Set 99.5mm Bore 8.2:1 CR Subaru EJ25 Turbo


  • 99.5mm bore
  • 8.2:1 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
  • Picklock grooves for easy lock removal
  • Pin fitting included
  • Includes a full set of pistons, rings, and wrist pins



These are the CP Pistons that feature a 99.5 bore with an 8.2:1 compression ratio forged for extra strength to higher more power and more boost. Whether if you are building a track-dedicated race car, drag car, or a high-powered street car, the CP Forged Pistons will put your EJ on steroids to turn the boost up, or to sustain prolonged track conditions. 

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