here's a site dedicated to this type of mod:
www.frogracing.us
you could probably contact them via phone and they could help you out with some tips/pointers
also there is a vendor called rallitek that sells lift kits and stuff
Frog Racing - Rally Car Prep
You have decided to take the plunge and transform your car into a rally car. Here are a few pointers to help you in the process on a budget. Most of the information is based on our experience with our Subaru RS, WRX & STI mostly GC & GD chassis (check the PrincesSTI, FrogSTIr, Le Toad and Le Toad 2
you could probably contact them via phone and they could help you out with some tips/pointers
also there is a vendor called rallitek that sells lift kits and stuff