I am trying to buya Miata to race in the stock class. I am confused with the rules. Can I put limited slip in a car that did not have it, the same type of springs & shocks, & bracing as the sports model? In other words, can you put the best of everything that was available from the factory for that year and still stay in stock class. I have found a very plain 1999, would put LSD, 16" wheels, and the sports package suspension, it still stays stock right? where can I find theses rules posted Thanks Bob Covington