i think they're all the same, for about 4 bills u get everything. Keep in mind, its the installation that makes your car harder to steal. I have a viper 800, and i rerouted everything so you cant find the wiring or set it up that if u disable the alarm u disable the car..(I.E. taped the alarm power wire to the battery wire, and hide it with wire loom)..so if u cut alarm wire, u cut car battery power. also, i had the viper's ecu moved to another location in the car..and all wiring was covered up with combo of duck tape and electrical tape.
just say, my car is a bitch to steal..hahahaa..