Look mate where to start is most definately a personal priority, but you speak to anyone on here and theyll give you a certain 4 or 5 very attainable modifications that will maximise your cars performance without opening her up. Definately Cold Air Intake and Filter will optimise your cars air breathing abilities for pending on your model, relatively little coin. Exhausts can be pricey for Stainless, but can get very reasonable mild steel exhausts for cars such as yours that will do just as a good a job (my vz under warrantly requires Stainless extractors, cats etc as well as a memcal). Tints always good, dark windows cool factor plus reduce suns uv rays on your precious interior. Getting some Brembos on there probably wouldnt be required without some kind of power increase to warrant it but if monies are no worries, hook them up. Id check with members from your area for recommended workshops to install these goodies.