very very lucky man. I had a similar situation when i got my exhaust fitted as i was on cloud 9 with the sound. Car right up close behind me on a dark road and as i was slowing down for a roundabout i had a few blips of the throttle, turned out it was the cops behind me and got pulled over, the full car searched and all my tyres and everything checked. In the end the policemans conclusion was my exhaust must have a hole in it as its too loud and i had to get it checked at a garage. never once got stopped with my very loud k1 but the first day of having the quieter cobra fitted i get stopped. WTF?