I was on the City West Link headed east toward the city. I changed lanes and was ahead of this one car who proceeded to aggressively tailgate me. I changed lanes again to get some room but he did the same thing too. I was still in front of him as we both changed into the same lane. Then, even though I was already in the lane in front of him (but not completely in the middle; still past the line) he floors it to try and get ahead of me. He probably thought he had enough room to squeeze through but his front wheel hit my exhaust, footpeg (took it clean off), engine cover and perhaps some of the plastics (need to double check). It was a moving collision and thankfully, I didn't come off... we both just kept going. I signalled him to stop and we both stopped at the UTS Haberfield Rowing Club. Right off the bat, he gets out of his vehicle and tells me he's a cop and tells me I was riding recklessly. I politely disagreed. Upon looking at his car, looks like his tyre hit my exhaust, the metal behind his front left wheel was what hit my footpeg and the engine cover was what scraped along the left of his car. We took each others details, all while he kept abusing me and telling me I was an idiot. He kept re-iterating he'd see me in court. I just took photos of our vehicles. I've reported the collision to the police and to my insurer. I'm comprehensively insured so no probs. It's in the hands of the insurer now.