4-Trumpet Train Horn Kit 150dB

The 4-Trumpet Train Horn Kit 150dB ships as a complete bolt-on set: four trumpets, a 12V air compressor, a 0.8 gallon air tank, and the lines to wire it up.

The four-horn array lets the compressor charge the tank in advance so the blast hits full pressure the moment you tap the button. Use it on trucks, full-size cars, and boats where a stock horn is not loud enough on busy roads or open water.

Why this train horn kit works

• 150 dB output: louder than a stock vehicle horn, designed for highway and open-water use.
• 4 trumpet array: stacked tones give the deep, layered train horn sound.
• 12V air compressor: wires to the vehicle battery, no external air source needed.
• 0.8 gallon air tank: stores pressure so the first blast is at full volume.
• Universal mount: fits trucks, full-size sedans and SUVs, and powerboats with a 12V system.

Specs and details

• Sound output: 150 dB
• Trumpets: 4
• Compressor: 12V
• Tank: 0.8 gallon (3 L)
• Applications: trucks, cars, boats with 12V electrical

Round out your build with our 10-Piece Ball Joint Press Kit.

Frequently asked questions

Is a train horn legal on a street vehicle?
Train horn legality depends on local and state vehicle code. Many states cap horn output at 110 to 112 dB on public roads. Check the rules in your state and county before installing, and use the horn responsibly.

How long does the tank take to fill?
The 12V compressor charges the 0.8 gallon tank in roughly a minute from empty to working pressure, then cycles back on to top off after each blast.

Where do I mount the horns and tank?
Trumpets bolt to the frame, bumper, or bed rail with clear forward-facing space. The tank and compressor mount in the engine bay, under the bed, or in the trunk where they stay dry and away from exhaust heat.

Will it drain my battery if I use it often?
The compressor only runs in short bursts while it tops off the tank. Wire it through a relay and switched power to avoid any parasitic draw.