CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (100.0mm) - Size (+0.5mm) - CR (9.0)
Whether you’re racing a Honda, Acura, Mitsubishi, Toyota, Nissan, or Subaru, CP Pistons has specially designed high-performance pistons off-the-shelf. In most cases, these will directly replace the stock pistons.
* High strength aluminum forgings
* Super lightweight designs
* Fully CNC machined and balanced to +/- 1 gram
* Wrist pins included at no extra cost
* Accumulator groove included
* Double pin oilers, force fed from oil ring
* Pick lock grooves for easy lock removal
CP Pistons are priced and sold *per piston*. 4 Cylinder engines will require 'Quantity 4' of each part #.
Comp Height: 1.208
Comp Ratio: 9.0:1
Bore: 3.937 (100.0mm)