[thstone]

Modifying a car and then looking for a class to run in is not likely to result in the best possible outcome.

My best suggestion is to figure out what class that you want to compete in and then modify the car to be at the very top of the class within the rules. Also, go out to the track and take at look at the leading cars in that class and talk to the owners to find out what mod's pay the most dividends. This will give you the best chances of being competitive.