I've used JE pistons in a rebuild of an '02 STi. I agree with Nauli, very quiet, just like OE. Steer clear of the ACL forgies, may have been poor clearancing by the machine shop but very rattly when cold.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i