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13:1 or 13.5:1 piston

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Whats the performance difference to a 06 RMZ450 when using a 13:1 or 13.5:1 piston, which is the better choice. I see the 06 have less ratio than the 05, why was this.

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not much differnce bro but you will basically have to use race gas if u up your compression a lot. Or at least a high octance.

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