Travelling outbound on the West gate freeway last night, just after the Kororoit Ck road bridge a bike headlight appears in my rear vision mirror, closing fast. I'm in the left lane and it splits my car at high speed. As it goes past the bike bounces off the rev limiter. The rider is dressed in jeans, sneakers and a grey hoodie with a black helmet. Couldn't get the bike type but it has a tail tidy and NO number plate. He bounces off the rev limiter a few more times as he speeds away. Really odd. Then he takes the Newlands street exit which has a nice hair pin and I speed up to see how the hero handles it... he virtually comes to a stop and wobbles around then hammer at high speed in a straight line to the red light at the T intersection. He wobbles to a stop and he's jumpy, the body language was like he was going to run the red. Light goes green, he's turning right, barely wobbles around to make the turn and floors it, bouncing of the rev limiter a few more times messing up the gear changes as he goes, then it occurs to us that this bike is being ridden like it is stolen. The guy then negotiates a round about is less than graceful style and carries on at high speed. I couldn't tell what bike it was, but it was also either missing a muffler on the right or it had a shorty pipe. Anybody we know?