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12:1-13:1 depending on what kind of fuel control you had. Tuning is the key. I myself wouldn't go over 12:1 with out some extreme ecu upgrades and really good tuning.
__________________ +Chanc+ says: I went pee with gloves on.
also depends on the quality of gas where you live. Some places have decent 93, here we only get shitty 91. I wouldn't go past 12:1 here without some thorough tuning.