I just switched to V&H mufflers and mine did the same thing. I ran three autotunes with the PV and it has stopped. I also had a lot of gurgling on the exhaust on decal before the three tunes. That is gone as well. Mine was a consistent pop when I went above 3K rpms on shifting from first to second. If I stayed under 3K, no pop.
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2013 FLTRU, Jackpot 2/1/2 Stainless Ceramic Coated Head Pipes, Fuelmoto Stage 1 Intake, Power Vision, Jackpot Full Size Ceramic Crossover, MADSTAD 16" Windshield, Motolight Running Lights, Nostalgic Rails, Airhawk R, Hayden Primary Tensioner, V&H Roland Sands Slant Slip-Ons