The popping is normal...like lil backfires...its fk all...I got the same tbe as u...fitted it myself..they dont fit right and i got the fking knocking too...pissed me the fk off! comes and goes..mainly when taking off in first or sometimes when idle i have to just tap the throttle get fk it off...dunno what to do im meant to bring it to asg to check it but aint got round to it yet...my dump pipes too short n touches the bottom of the gearbox..also at the back the resinator almost touches the underbody of the car...meh who knows...hit me up with how u end up going tho!