I haven't had my car now for almost two years, but I seem to recall from the manual that it says to not operate the car about 65 mph if the spoiler is malfunctioning.

The Crossfire is a striking design. But it is NOT aerodynamic and as you approach 100 mph, or even less, that Kam tail design is not aerodynamically sound and the car is designed to get a bit squirrelly in its handling, unless the spoiler is out.

I wouldn't consider driving this car north of 100 mph unless that spoiler was working. Simply not a good body design.