Last year Subaru sent one of their WRX STI rally/race cars around the motorcycle Isle of Man TT circuit. Here's the full lap, including commentary from the driver. Note the instruments on the screen, showing speed, heart rate, etc. I recommend watching it in full-screen mode to get an idea of just how fast he's going on the tight, narrow circuit.
A great piece of driving - but you couldn't pay me enough to ride next to him!