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Forged Piston Kits

Cosworth forged pistons are engineered and manufactured in the UK using the same processes developed for their Formula 1 engines. Features include xylan anti-scuff skirt coatings, ultra-strong pins, polished domes, and anti-detonation bands. Each application uses a unique forging to minimize weight and ensure the strongest possible piston. Subaru applications use a proprietary Cosworth alloy similar to 4032, a high silicon alloy with a low expansion rate and high wear resistance making it ideal for extreme street performance as well as dedicated track applications. Piston kits are priced with rings. Replacement ring sets are also available separately.

Usually ships in 2 to 3 days.

Manufacturer: Cosworth

Applications:

  • Subaru WRX STI MY15-17 w/ EJ257
  • Subaru Impreza STI MY04-14 w/ EJ257
  • Subaru Impreza WRX MY06-14 w/ EJ255
  • Subaru Legacy GT MY05-12 w/ EJ255
  • Subaru Outback XT MY05-09 w/ EJ255
  • Subaru Forester XT MY04-13 w/ EJ255
  • Subaru Impreza WRX MY99-05 w/ EJ205
  • Subaru Impreza STI MY99-00 w/ EJ207
Part No. Description Bore Size Price Ea. Add to Cart
10001430 Cosworth Piston & Ring Set 79mm Stroke 8.2:1CR 99.5mm $829.99
10001431 Cosworth Piston & Ring Set 79mm Stroke 8.2:1CR 99.75mm $829.99
10001432 Cosworth Piston & Ring Set 79mm Stroke 8.2:1CR 100.0mm $829.99
10001436 Cosworth Piston & Ring Set 79mm Stroke 9.2:1CR 99.5mm $829.99
10001437 Cosworth Piston & Ring Set 79mm Stroke 9.2:1CR 99.75mm $829.99
10001445 Cosworth Piston & Ring Set 75mm Stroke 8.0:1CR 92.0mm $829.99
10001446 Cosworth Piston & Ring Set 75mm Stroke 8.0:1CR 92.5mm $829.99
Replacement Parts
Part No. Description Bore Size Price Ea. Add to Cart
RCH-1515 Piston Ring Set For Cosworth Piston Kit 99.5mm $99.00
RCH-1516 Piston Ring Set For Cosworth Piston Kit 99.75mm $99.00
RCH-1517 Piston Ring Set For Cosworth Piston Kit 100.0mm $99.00
RCH-5160 Piston Ring Set For Cosworth Piston Kit (EJ20 75mm Stroke) 92.0mm $134.00
RCH-5161 Piston Ring Set For Cosworth Piston Kit (EJ20 75mm Stroke) 92.5mm $134.00
RCH-3605 Piston Ring Set For Cosworth Piston Kit (EJ20 79mm Stroke) 92.0mm Stroker $134.00
RCH-3607 Piston Ring Set For Cosworth Piston Kit (EJ20 79mm Stroke) 92.5mm Stroker $134.00
PA2674 Spare 23mm Piston Pin For Cosworth Piston Subaru $68.05
PP5433 Spare 23mm Piston Pin Circlip for Cosworth Piston Subaru $7.00
RS-CWP-TOOL RalliSpec Cosworth Circlip Installation Tool Subaru $175.00