Coming home from work this morning, passed a black 540i on the highway. I really don't know a lot about these, I would say it was at least a '99. As soon as I passed him he switched lanes and matched my pace. He followed for a few miles and when traffic opened up he moved over to the slow lane and punched it. We were going about 70, I threw it in 3rd and floored it. He was at my back door when we started, when we stopped I was going 120 and he was about 4 car lengths back. He stayed with me up to about 80 and then I just started pulling. He didn't let off either, I had the windown down and could hear his motor. Anybody know what the top end is like on one of thse cars?