Yeah, just from some recent playing with a fully upgraded Countach, I can go well above 400KPH. It almost maxes out the tachometer to 9000RPM.
I was seeing this on the “Cruising” course, both the first and last segments, and probably others along the way. The fully upgraded Countach is a lot faster than you’re giving it credit for.
And all this is with full assists: automatic transmission, anti-lock brakes, traction control, the whole nine yards. I’d presume much faster is possible if you turn assists off?