I was driving a M3 in California last winter, and got into a 'race' with a GT on the 101 between Santa Barbara and Ventura. We were just playing around, getting up to about 130 or so, weaving around traffic (all you safety niks can withhold your comments, I'm not going to pay attention to them anyways! ). That GT was fast! Sounded wicked too. Can't argue with 500 horse!