1: 1 Custom Forged Pistons kit For 4Cyl Subaru EJ25/EJ20 with Rings and Pin
For SUBARU WRX STI 2.0 16V EJ20
Cylinder diameter(mm): 92
Compression ratio: 8.5 :1
For WRX EJ255 2.5L
Cylinder diameter(mm): 99.5
Compression ratio: 8.5 :1
For EJ25 WRX STI 2.5l EJ255 EJ257
Cylinder diameter(mm): 100
Compression ratio: 9.8 :1