I would dump the stock ecm and upgrade to an 86-87 to have more tuning ability, upgrade injectors, fuel pump, go with razor's kit or run e85 and have my fuel lines upgraded. The stock turbo would be another limiting factor but I know Bison is working on this. Exhaust, 3 inch down pipe, like mentioned it really depends on what you can do yourself and how much you want to invest, seriously I wouldn't mind having a nice driver for the street only.