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fatoni You are confusing racing with autocross. The latter is another story. You don't have big straights and high speeds. And we are talking here about stock performance or almost stock performance cars which is the main parameter. If emillio says that the same rules apply on a race track, then he doesn't have real experience in this area or he just tries to sell his products ...
And just accept it: Autocross isn't racing
http://www.thetruthaboutcars.com/201...s-isnt-racing/
If you are an autocrosser, you should try someday the real thing
. Have a good day too!