M3 vs. M3

I was on my way home with my wife and daughter when I pass a parking lot and notice a black 4 door M3, he was turning to go the other way but when he saw me pull out he turned my way and quickly caught up to me. He went flying past then just slowed down. He drove next to me for a few minutes and was revving his engine. I wasn't planning on racing but my wife kind of asked me too. Well the road was empty as could be so I said ok, whatever. so we are rolling along at 40 and we go on the third honk, I immediately pull a car length on him and start to walk him even more, by time I hit 80 and shut it down I was about 2-3 car lengths in front of him.

He just flew past me and never braked, saw him get on the freeway in front of me and he probably took his car up to 130, I could just see him keep pulling away in the distance, I wasn't about to follow him with my wife and child in the car.

For all I know he was stock so the outcome sounds about right. I really wish he wouldn't of just sped off, I would have liked to pull over and talk to him.