[SAJ_1982]

Not sure what causes it but I actually really like it when it does that, gives it a proper muscle car feel then. Also i've only noticed it on downshifting or reving the car at standstill, it's not something that happens when you driving normal and changing up the gears or when your pushing the car hard either.

I'd suggest a resonated system if you dont want the poping, but then it isn't going to be that much louder than stock.