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Where would I bolt the airhorn to? Under the car? Then would i wire the horn to a switch in the car ? I want to use it for when im driving and old people get in my way or to piss off friends . I really want this so could i get some help

 

yeah, just hook it up to yourhorn switch.. or a relay

 

Wouldn't you need a compressor for the air?? Usually the semi trucks get the air from the same place as their cabs (air ride cabs)