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Old 02-24-2004, 09:24 AM   #17
Scooby Specialist
Member#: 14364
Join Date: Jan 2002
Chapter/Region: MWSOC
Location: Saint Louis, MO
2003 WRX, '06 Armada
05 Vette & 05 STi (sold)


Yeah for sure, anyone can look at any new age STi piston and tell its cast. Version 8 JDM STi and USDM 2.5 STi both have similar casting marks. Version 7 were obviously forged.

Im sure they switched for a certain reason.

US STi piston:

1st pic is Ver 7 STi piston from APS website

2nd Picture is Ver 8 STi vs. ROSS forged piston.

3rd picture is of the underside of both... NOTE the similarities to the USDM STi piston with the JDM 2.0 ver 8 STi piston.

4th picture is of JDM ver 7 STi piston from APS.

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