Hi Neilda,
In my German official documents and also in the certificate of conformity the top speed of the roadster 3.7 is stated as 250 km/h, which is 155 mph. After the first 1000 miles run-in I tried it and 250 km/h was no problem for the roadster. The needle even was at the end of the speedometer, which 260 km/h +. I compared the speedometer with my navi and there was a 5% deviation ( 200km/h the speedometer and the navi was at 190 km/h).
The car is very stable at high speed. I had no problems and I am really not a race driver. The power is impressive especially if you are in the 5th gear and above 4000 rpm. Regarding acceleration and speed I couldn't find a difference between hood up or down (this was different in my old 4/4).
Regards,
Axel.
