Back fire, You said you filled up with race gas so 100 OCT right, WOT and shift you will get a pop for the unburned fuel.. I only get it once and while when a down shift to slow or if I'm riding first in traffic and go above 3k or so and get off to slow down again.. Normal
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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