On my 02 Screw I bought a cheapo air horn kit like 10 bucks a few years ago at Harbor Freight. The air pump went bad so I just installed a 3 gal air tank, electric air soleniod and about 25ft 3/8 size 300 psig rated rubber air hose from stuff I had laying around.

The two horns are mounted just behind the grill and I wired up the air soleniod right next to the oem truck horns using the same power. Oem truck horns still work but you can't hear them .....

Was able to run the air hose inside the box frame rail which keeps it away from the motor, exhaust and supension parts. Where the box frame ends I just wire tied it to the frame and into the bed.

Going to mount a service valve inside the gas cap door so after refueling I can top off the tank.

Pump the tank up to 75 psi and works like a charm and good for 50 blasts. Never seen Texas Long Horns move so fast now.

Now I'm ready to take my kids back to school and blast these brain dead drivers until they wake up now