The piston is one of the most important components within the engine. It can be subjected to directional change up to 285 times every second and must withstand acceleration forces of 8500g’s. Cosworth high performance forged pistons are designed and engineered to withstand this type of punishment and still perform. All Cosworth pistons are manufactured using the same methods as their Formula One pistons and include features such anti scuff skirt coating, ultra-strong pins, polished top and patented antidetonation bands. Additionally, each application uses a unique forging to minimize weight and ensure the strongest possible piston design.

| Forged Piston Sets - Includes pistons, pins and circlips | |
|---|---|
| Subaru | |
| PA2667 | Subaru WRX STI EJ25 (2.5L) 99.5mm 8.2:1cr |
| PA2667+025 | Subaru WRX STI EJ25 (2.5L) 99.75mm 8.2:1cr |
| PA2667+050 | Subaru WRX STI EJ25 (2.5L) 100.mm 8.2:1cr |
| PA2690 | Subaru WRX EJ20 (2.0L) 92.mm 8.0:1cr |
| PA2690+050 | Subaru WRX EJ20 (2.0L) 92.5mm 8.0:1cr |
| 20002431 | Subaru WRX STI EJ25 (2.6L) 99.5mm 8.2:1cr (For use with 81mm crankshaft) |
| 20002432 | Subaru WRX STI EJ25 (2.6L) 99.75mm 8.2:1cr (For use with 81mm crankshaft) |
| 20002433 | Subaru WRX STI EJ25 (2.6L) 100.mm 8.2:1cr (For use with 81mm crankshaft) |
| 20002489 | Subaru WRX EJ20 (2.2L) 92.mm 8.0:1cr (For use with 79mm crankshaft) |
| 20002490 | Subaru WRX EJ20 (2.2L) 92.5mm 8.0:1cr (For use with 79mm crankshaft) |
| Nissan | |
| PA2688 | Nissan VQ35 (3.5L) High CR 95.5mm 10.3:1cr |
| PA2688+050 | Nissan VQ35 (3.5L) High CR 96.mm 10.3:1cr |
| PA2687 | Nissan VQ35 (3.5L) Low CR 95.5mm 8.8:1cr (Turbo application) |
| PA2687+050 | Nissan VQ35 (3.5L) Low CR 96.mm 8.8:1cr (Turbo application) |
| 20002036 | Nissan VQ35 (3.5L) High CR 95.5mm 11.0:1cr |
| 20002038 | Nissan VQ35 (3.5L) High CR 96.mm 11.0:1cr |
| Mitsubishi | |
| PA2689 | Mitsubishi Evo IV-IX 4G63 (2.0L) 85mm 8.8:1cr |
| PA2689+100 | Mitsubishi Evo IV-IX 4G63 (2.0L) 86mm 8.8:1cr |
| PA2701+100 | Mitsubishi Evo IV-IX 4G63 (2.2L) 86mm 8.8:1cr For use with 94mm crank |
| Performance Piston Ring Sets For Cosworth Pistons | |
|---|---|
| 20001515 | Subaru WRX STI EJ25 (2.5L) 99.5mm |
| 20001516 | Subaru WRX STI EJ25 (2.5L) 99.75mm |
| 20001517 | Subaru WRX STI EJ25 (2.5L) 100.mm |
| PR7320 | Subaru WRX EJ20 (2.0L) 92.mm |
| PR7321 | Subaru WRX EJ20 (2.0L) 92.5mm |
| 20001512 | Nissan VQ35 (3.5L) 95.5mm |
| 20001514 | Nissan VQ35 (3.5L) 96.mm |
| PR7317 | Mitsubishi Evo 4G63 (2.0L) 85mm |
| 20002246 | Mitsubishi Evo 4G63 (2.0L) 86mm |