DEI viper550esp, to do it right you will need 7 additional relays, Viper dealers will have details on the car, and what the extra relays are for. Make sure they have experience doing 7 series, they are the hardest of all BMW's to do right, Circuit City has the info on these cars. i.e. if you don't lock/unlock the doors right the dead bolts won't work, also remote starter has to unlock doors, start car, then relock, unless the door is open when started then it just has to interupt the alarm trig. very detailed to make it perform correctly. well worth the time I really like having the feature. best regards, Tim