The first thing you should do is...Engine Swap!Look for a good B-series engine (B16A or B18C) to swap in so you have a good platform to start making more power from.After that I would suggest you install a good suspension, upgrade your brakes, and invest in a nice set of rims and tires. After doing your suspension and engine swap, start putting money into your engine and crank some horsies out of it!As for your exterior...please keep it tasteful. Do not make it look like it came out of Fast and the Furious....keep it clean and "sleeper-like".