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I haven't had any backfire at all with my HKS SSQV's. It might happen with some cheaper BOV's, but not these. BTW, an AFC isn't all that useful anyways. As I have said many times before, I wouldn't advocate tuning with it because it is a hack. Changing your MAF signal to the ECU is not a good way to tune as you aren't just playing with fuel delivery, but also timing.
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