I had a 2000 Mustang GT convertible and got it up to about 140 or so on hwy 101 going up the WA coast on a nice long stretch of unoccupied road. With the top down the roar of the wind was so loud I couldn't even hear the stereo (AC/DC Back in Black) anymore. But I must say that it felt solid... In fact, better at 115+ than at 90 or less. The aerodynamic effect, the "kush" pressing down on the car didn't really kick in until I got it over 105 or so... And from there on out it just squatted lower and got more solidly fixed to the road with more speed. Mmmm... Was a fun day. :-)
'Stang GT does great in a straight line.
Z does great in twisty roads.
She ate sammiches for lunch.
/johnny