rx7 2nd gen for solo 1
 

I am thinking about getting a 2nd gen rx7 turbo for solo 1 which is racing on a road course against the clock. There are a few classes. The first basically stock allowing three points and the next one up allowing 6 points plus race tires and wheels finally the class with unlimited points. I will most likely be going into the second class. Any suggestions I can get would be great. What should I be looking to do to the car. I may have a sponsor I need to showcase so I need to make the fastest car possible for the class am in. If you don't suggest a turbo please tell me why. Here are the rules I run under. Look under car prep. http://www.wcma.ca/2003WCMASoloRules.pdf