I would recommend getting a set of topline pistons, they are pretty much an OEM piston but much cheaper and can handle alot of abuse.
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Topline Pistons w/Rings Set 8.0:1 : Mitsubishi Eclipse 6-Bolt
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1990 GS-T
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1990 GST
2004 BMW 325i