I race an Evo 2 and I believe that at the mph you plan to run your car will be fine.
I don't know your rule restrictions but if its legal just drop an air dam straight down in the front and youwill have a pretty good setup. I had my car in the wind tunnel in that configuration and it was fairly well balanced, not very aerodynamic but not dangerous as long as you know how to drive(it will never be stable like a supercar).
Mike Reichen
Hi again Mike.
What is an Air dam ? I´m fluent in the english language, but there are always strange words around

A picture would be great if you have the time... also, where can i read about yout evo ?
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....Kristian