I'd keep it simple at first. De badged it, fit a set of clear/smoke side repeaters, tint the headlight insides (its easy enough, just removed the lights, strip out the insides, rough up the area, the primmer, then paint. After that, reassemble). Then you could look at stuff like induction kits (or drilled airbox with uprated panel filter if you on a budget), a stainless steel cat back exhaust system. The mk4 has so much potential and is so underated in my opinion.