I'm thinking of buying the CPT-8000 from a guy off of ebay... Was wondering what else I would need after I have purchased the phone to have it rigged in my car.. My car is a 02' 325ci and says its pre-wired for phone so is everything there or do I still have to buy more install parts??? I don't have the sharkfin antenna or anything so I guess I have to get that.... But since its pre wired is everything in place or will I have to purchase something?? and if so could someone give me price that it may cost----- Thanks