ive herd a min of 108 with no airbox.. i actually tried 105's first, and it was way to lean.. couldnt rev past 7k. so i jumped to 110's and it pretty much seemed right on for me, except on extreme hot summer days like 100+ or really humid it would break up just a little at like 11-12k.. now with the cooler weather here ( 60-70's ) it runs real good so i may try bumping it to 112's next year for the hot summer. but overall 110's did pretty good in my situation.
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