Befor I get started let me state that this is what happened weither the carrera has at 100% throttle or not.
I was coming home from work two days ago when I came up behind a carrera 4. The driver saw me and pulled over into the right lane and gunned it. I followed him step for step from 80-approx 95 mph. He backed off and I passed him. Later on he snuck up on me and when he got about a half of a nose ahead he gunned it again. I down shifted to no avail. He just kept pulling. He had a slight head start and I actually started to run even with him till about 120 at about five car lengths behind but then the rex started floating (no spoilers ect.) and a scary hollow wailing noise came from under the car. I have no idea what the heck it was. but I coasted down. It was extremely windy that day.
The Carrera however just kept pulling away like it was in a vacuum. That was pretty cool to watch the aeodynamic/HP advantage of the Porsche in action.
I still was impressed with the Rex though but at highspeeds it can be nerve-racking.