Model HK4: Universal ProBlaster Chrome Quad Air Horn System
KL HK4
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Model HK4: Universal ProBlaster™ Chrome Compact Quad Air Horn System
Stop Being Ignored. Start Being Heard. The Model HK4 is engineered specifically for drivers who demand maximum sonic impact and a sharp, classic Chrome aesthetic. This system takes our best-selling platform to the next level by utilizing a quad-trumpet configuration to produce an even louder, richer, and more complex tone than standard setups. With four tuned trumpets, the HK4 ensures you have the undeniable presence of a much larger vehicle, making it the ultimate professional-grade upgrade to replace a weak factory chirp with a head-spinning blast.
Professional-Grade Performance At the heart of the system is a high-efficiency 130 PSI air compressor paired with a 1-gallon air tank. This rugged, oil-less system is designed for durability and "set it and forget it" reliability. Featuring integrated thermal protection and a complete wiring and installation kit, the HK4 offers a dependable solution for drivers who require consistent, high-pressure performance on demand. Whether you are navigating dense traffic or open highways, this system provides the air capacity needed to power through any situation.
Big Sound – Small Footprint Installation is simple thanks to the kit’s clever, low-profile design. Despite featuring four distinct trumpets, the compact footprint of the zinc alloy horns allows for a seamless fit in tight locations—such as behind the grille or tucked neatly inside the engine bay—where traditional train horns simply won't fit. By choosing the HK4, you are joining thousands of drivers who trust Kleinn Automotive Accessories for superior quality and "get out of the way" authority. Don’t settle for a vulnerable factory horn when you can have the quad-trumpet power of the Universal ProBlaster™ HK4.
WHY CHOOSE MODEL HK4-1?
- Quad-Tone Authority: Unlike standard horn kits, the quadruple-trumpet design delivers a startling, high-pressure quad-tone blast designed to pierce through the loudest traffic and heavy machinery.
- Sharp Classic Look: Featuring our Mirror-like Chrome finish, these horns are built to make a high-profile statement with a classic look and the incredible loudness that Kleinn clients expect.
- Upgraded 130 PSI Power: We’ve boosted the output to a 130 PSI system, providing higher pressure for a louder initial blast and faster recovery times between uses.
- Submersible Reliability: Equipped with the 6270RC waterproof air compressor, this system is designed to thrive in harsh environments, from off-road mud to coastal salt air.
- Longer Blast: The upsized 1-gallon air tank allows for double the hang time on the horn blast.
- Universal Fitment: The clever, low-profile design allows for a seamless fit in tight locations where traditional, bulky train horns simply won't fit.
WHAT’S IN THE BOX?
- 141: Quadruple Chrome Metal Compact Air Horns
- 6270RC: 130 PSI Waterproof Air Compressor (25% Duty Cycle)
- Snorkel Kit: Remote mount intake filter for clean air delivery (Draw air from inside the vehicle)
- 6270RT: 1-Gallon steel air tank with internal anti-corrosion coating
- FIT34: Fitting Pack (Sealed pressure switch, safety valve, and drain valve)
- Installation Kit: Comprehensive wiring, airline, and all necessary hardware
Air Horns vs. Train Horns:
Find Your Signature Blast
Compact Air Horn Series
Engineered for "Emergency Vehicle" authority. Our compact series delivers a sharp, high-frequency blast designed to cut through the thickest noise instantly. Featuring high-pressure 1/4" airline and 3.5" wide bells, these horns produce a piercing scream that commands attention in heavy traffic or loud construction zones.
- Air Horns: Models 102, 130, & 141
- Universal Air Horn Kits: ProBlaster Models HK2, HK3, & HK4
- Air Horns: Models 101, 102-1, 130-1, 141-1
- Universal Air Horn Kits: ProBlaster Models HK1, HK2-1, HK3-1, HK4-1, & HKUTV
Train Horn SERIES
Don’t just make noise—make an impact. Engineered with massive 6-7" end bells and heavy-duty drivers, our Train Horns move a staggering volume of compressed air to create a deep, earth-shaking rumble you can feel in your chest and hear down the block. This is the authentic tone of a 40,000-lb locomotive and the ultimate "clear the way" authority that every Truck and SUV deserves.
Classic Chrome
- Train Horns: Models 500, 501, 502, & 630
- Train Horn Kits: ProBlaster Models HK6 & HK8
- Train Horns: Models 220, 230, & 730
- Train Horn Kits: ProBlaster Models HK5, HK7, HK9, & HK9-Slim
Professional-grade engineering. Legendary Kleinn Performance.
Too Loud? Too Bad
Air Horn Specifications
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Quad Chrome Air Horns |
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Part Number |
Model 141 |
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Number of Horns |
4 Horns (Single Mount) |
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Warranty |
1-Year Warranty |
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Construction |
Chrome-Plated Zinc Alloy |
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Vortex 4 Chrome 12v Solenoid |
P/N- 307 w/ ¼” Airline Input |
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Min / Max Pressure |
120 - 150 PSI |
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Output (dB) @ 150 PSI |
150.3 dB |
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Dimensions |
14” L x 6” W x 6.5” H |
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Minimum Tank Size |
0.5-Gallon |
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Airline Length and Size Included |
12’ of 1/4" OD Airline |
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Air Compressor Specifications
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12-Volt Light-Duty Compressor |
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Part Number |
Model 6270RC |
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Warranty |
1-Year |
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Max Pressure |
130 PSI |
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Duty Cycle |
25% @ 100 PSI (@ 72° F) |
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Flow Rate |
@ 0 PSI (13.8 Volts): 1.56 CFM |
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Compressor Type |
Waterproof Sealed, Oil-less |
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Voltage |
12-Volt DC |
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Motor Type |
Permanent Magnetic Motor |
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Max Tank Size |
0.5 Gallon |
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Max Amp Draw |
14 Amps |
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Dimensions |
6.4” L x 3.5” W x 4.6” H |
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Mounting Holes |
6.14” L x 2.76” W (5mm Diameter) |
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Mounting Note |
Mount in any position except upside down |
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Shipping Weight |
7 lbs |
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Pressure Switch/ Safety Valve HK1-HK2 |
P/N 2121 (Pair w/ 52145 for 120 PSI kits) |
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Pressure Switch/ Safety Valve HK3-HK4 |
P/N 2131 (Pair w/ 52155 for 130 PSI Kits) |
Air Tank Specifications
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1-Gallon Air Tank |
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Part Number |
Model 6270RT |
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Warranty |
1-Year |
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Tank Capacity |
1.0-Gallon |
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Construction |
All Steel Design (Gloss Black Epoxy Finish) |
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Internal Coating |
Internal Cortec Coating for Corrosion Resistance |
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Mounting Legs |
1 Leg w/ 2 Mounting Points |
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Air Tank Ports |
5 - 1/4" NPT Ports |
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Mounting Hardware |
Fitting Pack - 2 Bolts, Nuts, Washers |
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Max Pressure |
150 PSI |
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Dimensions |
11” L x 6” W x 8” H |
Air Tank Fill Rate Details
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Tank Capacity |
Tank Pressure Range |
Tank Fill Rate |
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.5 Gallon |
0 - 150 PSI |
1 Min. 11 Sec. (+/- 5 Sec.) |
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.5 Gallon |
110 - 150 PSI |
26 Sec. (+/- 3 Sec.) |
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1 Gallon |
0 - 150 PSI |
1 Min. 57 Sec. (+/- 10 Sec.) |
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1 Gallon |
110 - 150 PSI |
38 Sec. (+/- 5 Sec.) |
Installation Instruction Links:
Compressor Overview & Instructions

$459.95