How does timing affect power levels.
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Last time I checked, the "good" octane boosters contain MMT, which is used, where legal, to increase the octane rating of gasoline. To me, it is worth the $10 if race gas isn't readily available. But all we can get here in California is 91 octane premium, so if you already have 94 at the pump, an octane booster isn't going to make as much of a difference, I will give you that.
The OP said 93 octane pump gas, so I figure the octane booster is worth a few bucks for safety, considering that he isn't modifying the timing from stock.
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