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An air horn inside the cab might actually injure them and get you sued for having a booby trap which is illegal in the US in your house or on your property..... would be funny as hell if you caught it on camera though! Best make sure that you hit the right button on the fob.Just take the transmission ECU, it takes about 15 min to remove it on a WTEC III system.
Viper remote start systems have an interlock system that if the system is set to lock it won’t allow a start until it is unlocked via the key fob. If a start is attempted without unlocking it will run an alarm. The alarm could also be wired into an air horn solenoid as well, maybe an air horn placed inside the cab.
No one uses air train horns for their car alarm. That would get a lot of attention, fast IMO.No one pays any attention to an audible "car alarm" going off. It might as well be elevator music.