I have a Viper without remote start. Its a grate system. If you install it your self, you have to be very careful, not to short the control module out. You have to use relays to activate what you want to control with the system. You can not just hook up the alarm system to say your door lock or what ever. It has to go through a relay. The alarm module works on low voltage. Of you do not use relays you will short out the alarm system module.