What is the top speed of the typical course for you? Do you try and stay in second the whole time or shift? I am trying to help a friend gear his car accordingly. Thoughts? I don't have a lot of experience with auto cross. He has a 1.98 second ratio and a 24.6 inch tire. A 3.55 would yield 70 mph at 6700 rpm. He would have to shift at that point. Worth time going to a 3.33? 500 HP 408. Thanks.