First off, this is a dumb thing I did and don't recommend it. The other night on my way home from work, some guy in a heavily tricked out (and very noisy) 3-series obviously spotted me on the freeway and started pacing me and going back and forth. His windows were so dark, I couldn't see the driver at all. Anyway, he eventually pulls in front of me and gradually starts slowing down. As I move over to pass I hear his exhaust note and he takes off, so I jab the accelerator too. Obviously he wanted a little race. He actually overtook me, but when I hit about 110-120 MPH I noticed the dashed "power limit" line appear on the power meter. It went away as soon as I backed off the accelerator. I've read in some of the threads covering racetracks that the Model S starts limiting power after a couple of laps, but this whole exercise of mine was no more that 10 or 20 seconds. It was a quick burst of speed, then back down to normal freeway speeds. Is that normal? Surely I couldn't have overheated anything in that brief time.