BE SAFE BE HEARD Mounts to front right side engine guard. An Ear Piercing Blow of 128 decibels Mount to the front right side engine guard. System sold complete with all premeasured wires and hoses cut to length. The air compressor creates instant air pressure to the horns. Since the pressure is created so fast there is no need for a storage tank as on Semi Trucks and RVs. Although the pressure is very low 1215 psi it delivers a large volume of air 3 CFM or cubic feet per minute. This lowpressure high volume air supply causes the diaphragm inside the horn to vibrate at a high rate of speed or frequency the exact speed at which it vibrates is varied by the length of the horn or trumpet. Together the horn set produces an extremely loud 128decibel warning blast. This is approximately 4 times louder than most electric motorcycle horns,which usually rate at 87 decibels.