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i think the best way is to figure out what is the most important thing to you. for some it might be flat out performance, which in that case i think engine stuff should be up first. for others it might be handling, which in that case i would say coilovers,sway bars, etc. if you are happy with your car's performance/handling, then maybe it should be "show" type stuff like LEDs,redouts, etc. for me the two most important areas are audio and handling hence most stuff so far has been in those two areas.