I'm not sure if the guy was modded or not, all I could see was tinted windows and aftermarket wheels. I wasn't even paying him attention and my friend that was riding with me said "Hey, this guy beside you keeps bumping his throttle, I think he wants to go." I was about 1 car length behind the A4 and he nailed it. I threw it into 2nd as quick as I could (we were going about 30mph or so) and had to play catch up but by the time I got to 80 he was 2-3 cars back. He cut over in my lane behind me and wouldn't come up beside me again, but he did give a friendly wave out the window when I turned off. Anyone know what these things run stock?