how heavy a backfire?
If it was a sweet gurgle on decel its (awesome and) normal.
Others will chime in...
So first things first i went to go look and test drive a RS .:R32 and its a really clean car and all but it backfired/s so i was thinking could this be spark plugs/ coil packs? Should i buy this car and replace those myself? What would you if you were in this situation?