The Kleinn HK9 “Demon” Triple Train Horn Kit is designed for drivers who want the absolute pinnacle of train horn performance and onboard air capability. It delivers an earth-shaking locomotive blast while functioning as a complete pneumatic system for serious builds.
Built around the Model 730 Demon stainless steel horns, this system uses large, precision-tuned trumpets (approx. 18.25", 14.75", and 10.5") to produce a deep, harmonic tone that rivals real trains.
Additional features include a high-output 150–200 PSI waterproof compressor, a 5-gallon steel air tank, and a high-flow valve system with upgraded airline routing for maximum airflow. This setup ensures longer, louder blasts and faster recovery than any smaller kit in the lineup.
Engineered with universal fitment, the flat-rack modular horn design allows installation underbody, along frame rails, or behind bumpers while still delivering full-size train horn performance.
Installation is typically a bolt-on process with included wiring and hardware, making it suitable for both DIY and professional installs.
Whether you're upgrading for extreme road presence, off-road capability, or a full onboard air command system, the HK9 stands as Kleinn’s flagship solution. Now Available at LEER!
Features & Specifications
Product Type: Complete Triple Train Horn & Onboard Air Kit
Material: Stainless steel trumpets / steel air tank
Finish Options: Black XCR2.0
Mounting Type: Flat rack / modular mounting
Fitment: Universal
Design: Triple train horn system with full onboard air
Key Dimensions:
- Trumpets: ~18.25", 14.75", 10.5"
- Tank: 5-gallon capacity
Functionality:
- Multi-tone train horn output (~157–159 dB)
- Air-powered system with compressor and large tank
- Supports tire inflation, air bags, lockers, and tools
Available Options
The Kleinn HK9 Demon Train Horn Kit is available in:
Vehicle Fitments:
Universal (fits most trucks, SUVs, Jeeps, and off-road vehicles)
Finish Options:
Configurations:
- HK9 – Full 5-gallon onboard air system (maximum output)
Choose the HK9 if you want the loudest, longest-lasting blast with full onboard air capability.
Why Choose Kleinn HK9 Demon?
This product is ideal for customers who want ultimate performance with zero compromises.
- Loudest and most powerful kit in Kleinn’s lineup
- Longest blast duration thanks to 5-gallon tank
- Full onboard air system for utility and off-road use
- Premium stainless steel horns for maximum tone and durability
What’s Included
- Triple stainless steel train horns (Model 730 Demon)
- High-flow VX6003 solenoid (one per horn in upgraded systems)
- 150–200 PSI waterproof air compressor
- 5-gallon steel air tank
- Pressure switch, safety valve, and fittings
- Airline tubing (1/2" and 3/8")
- 35 ft tire inflation hose
- Wiring kit, relay, and horn button
- Installation hardware and instructions
Installation Notes
- Requires sufficient space for 5-gallon tank and compressor
- Requires 12V electrical connection
- Typical install time: 3–6 hours depending on setup
- Ideal for trucks, Jeeps, and large builds with available mounting space
Warranty Information
Kleinn Warranty
Kleinn products are backed by a limited warranty, covering defects in materials and workmanship.
