I recently had a Viper 160XVL remote starter installed at the local BestBuy and after 4 trips back to fix various glitches (windows wouln't work, radio disconnected, etc) they informed me that the factory alarm wasn't compatiable with the remote starter. So I can lock/unlock/ start it with the 160XVL fob but the factory alarm cannot be turned off or on with the same fob. Their answer was to carry the factory alarm fob and 160XVL fob and use both of them. Or find out the arm and unarm wires in the wiring harness. Then they would be able to connect the alarm to the 160XVL fob that locks/unlocks the doors. Anyone have any experiance with anything like this?