I've had both my Contiques up to the redline. 184kph/112mph. They both felt incredibely stable at these speeds. However I'm comparing this to my old 86 626. I reached the same speed in it once. There is a slight bit more floatiness in the Mystique and I figure it is due to the softer suspension. However I'm sure the stiffer the suspension in any car the better the ride quality a speed.

Green 96 mystique gs 4cyl mtx 16.9 in the 1/4 mile @102500 miles 95SE in Midnight Red MTX MSDS headers and y-pipe SVT exhaust SVT UIM Optimized se TB. Full pre 98 SVT body kit 15.741 @ 87.73mph :)