aiight man save your self teh head ache and stay away from teh ebay alarms. i cant tell you how many ppl come to our shop and they get ripped when the shit dont work to well. liek that one guy said dei is the way to go also prestige grate pager units and they are one of the best in the market. Also dont tuch that car if you dont knwo what the hell you are doing. it i sa nice car to work one but you can f up the wiring. and yeah you do need a bypass and an extra key to put in the bypass(556uw) so let a shop do it and one that is know to warranty there work...like ours.lol.