Loud Mouth 150PSI Triple Train Truck Air Horn Kit - Includes a 150PSI Air Compressor, 2 Gallon Air Tank, Chrome Triple Horns - Extremely Loud and Looks Great The chrome plated 100% steel horns are durable, extremely loud, and look great. The soul of the kit is a 150PSI/30% Duty Cycle/1.31CRM Viair Air quality Compressor. The Viair steel air tank safely controls the 150PSI. The kit comes with everything you need or your mechanic needs to install it.