How to "pimp out" the Hyundai Tiburon I bought?

Ok, the simplest thing to do is get some nice modern rims (I like black centers with polished rims). Do a "plus 1" addition. If you have 16 inch wheels with 50-series tires, go to 17 in wheels on 40-series tires. Skip the side skirts, the car was swoopy enough for its time. The engines on these cars are actually pretty robust, and similar to Mitsubishi engines in their design. You can either do simple mods like revised ECM mapping, cold-air intake, better plugs or for more speed a turbo or supercharger. If you add 50 or more HP I suggest lowering the suspension with a professional kit (shocks, springs, roll-bars).