Main Components: Horn, Air Compressor & Air Tank

Train horns are low, deep, and typically louder, with at least three notes. Air horns are usually higher in pitch and can still be very loud — tone preference decides which is “better.”

Bell shape and length, materials, pressure, and the number of bells all affect sound. Larger multi-bell horns are generally louder, though designs like Shocker XL stay compact while delivering big volume.

Horns themselves need little maintenance; keep moisture and debris out of the air system, and drain the tank regularly so pitch and volume stay right.

The compressor pulls air through the filter and packs it into the tank. Match compressor capacity to tank size and operating pressure.

• Fast-fill: quicker refill, shorter duty cycle — best for frequent honking, not regular tire / tool use.
• Constant / heavy-duty: longer duty cycle for tire inflation, air tools, or suspension work.

Tank size sets how much air you have. Fitment comes first — a huge tank will not fit every vehicle. Most compressors are rated around 5 gallons each; larger tanks (for example 8-gallon kits) often use dual compressors.

For honking only, expect roughly ~2 seconds of continuous honk per gallon on many horns (about 4–5 seconds on a 2-gallon kit).

Drain moisture regularly from the lowest port — turn the drain counter-clockwise until air and water escape, then tighten before refilling. Skipping this is a top cause of kit problems.