CP Pistons Aluminum Forged Piston Set / 99.75mm / 8.2:1 C/R | 2004-2021 Subaru STI EJ257 (SC7422)

CP Pistons
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Aluminum Forged Pistons for Subaru EJ257

Pistons are the backbone of any true hardcore racing engine and that’s where CP-Carrillo excels. Our Engineering department started off analyzing the competition, gathering industry data and deciding to make the highest level of pistons, period. The heart and soul of our pistons are built through our Engineering Department and its resources. This department is made up of several factors that push them ahead of the competition; Reverse Engineering, Design Experience and Flexibility, Analysis and R&D. As in racing, it takes a lot to be number one; here at CP-Carrillo we have it all and are number one in piston design, enabling our customers to come in first on race day.


  • High strength aluminum forging
  • Super lightweight designs
  • Fully CNC machined and balanced to within +/- 1 gram
  • Wrist pins included
  • Pin lock grooves for easy lock removal

  • 99.75mm Bore (+0.25 Oversize)
  • 79mm Stroke
  • 130.5 Rod Length
  • 30.7mm Comp. Height
  • -21.0cc Dome
  • 8.2 : 1 Comp Ratio
  • 399g Each


  • 2004-2021 Subaru STI

What's In The Box?

  • (4) Pistons
  • (4) Piston Ring Sets


  • Manufacturer Standard Warranty

Customer Reviews

Based on 1 review

Drooled like a kid in a toy store unboxing these beauties.