A:AnswerThey were able to do it to my 2010 Nissan Maxima but not my 2004 Dodge durango. The installer that did mine did say he is able to program most keys to work depending on the make and model of the car
A:AnswerYour current keyfob should still work like normal, ie lock and unlock the car. You will need to use the one provided to actually start the car remotely.
A:AnswerIt does cut offf when I open the door about 1/4 of the times I use it. It has never cut off when I start the car remotely with the car key only when I use the Viper remote.