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I'd be hesitant even to go to 550's with an safc neo, i'm running 480's and a z32 maf with mine, and i still have to take out almost 20% fuel up top (though thats become 15% now that i'm running a 25% e85 mix). Just remember the more fuel you have to take out or add in, the farther away your timing map will be, and that's what causes problems, especially if you're not monitoring knock.
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