was recently by my exhaust place and saw an RS-R backbox lying there. the previous owner thought it was a tad loud. so i installed it. the thing is when they chopped off my old back box, another car came in for a service, so i had to move my car further down the ramp. without any back box the car was LOUD. just curious as to the technical (i.e. non-legal) implications of driving without a backbox/muffler

anybody??