Model HK4-1: Universal ProBlaster™ Complete Black Quad Air Horn Kit
KL HK4-1
💳 Get it today, pay over time with Shop Pay Installments.
Couldn't load pickup availability
This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Model HK4-1: Universal ProBlaster™ Black Compact Quad Air Horn System
Stop Being Ignored. Start Being Heard.
The Model HK4-1 is engineered specifically for drivers who demand maximum sonic impact and a discrete, "blacked-out" 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 HK4-1 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 HK4-1 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 stealth black trumpets, the compact footprint of the stainless steel 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 HK4-1, 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™ Stealth HK4-1.
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.
- Stealth Aesthetics: Featuring our signature Black XCR2.0™ Stealth finish, these horns are built to blend in behind your grille or fit neatly under the chassis while the coated trumpets remain resistant to corrosion.
- 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?
- 141-1: Quadruple XCR2.0 Coated Black 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. This series delivers a sharp, high-frequency blast designed to cut through ambient noise instantly. With 3.5" bells, these horns produce a piercing scream that commands attention in heavy traffic.
- Compact Horns: 102 / 130 / 141
- Kits: HK2 / HK3 / HK4
- Compact Horns: 101 / 102-1 / 130-1 / 141-1
- Kits: HK1 / HK2-1 / HK3-1 / HK4-1 / HKUTV / Vehicle Specific Kits: 102,102-1
Train Horn Series
Don’t just make noise—make an impact. Engineered with massive 6-7" bells, our Train Horns move huge volumes of air to create a deep, earth-shaking rumble. This is the authentic tone of a 40,000-lb locomotive.
- Train Horns: 500 / 501 / 502 / 630
- Kits: HK6 / HK8
- Train Horns: 220 / 230 / 730
- HK5 / HK7 / HK9 / HK9-Slimline / All Vehicle Specific Train Horn Kits
Professional-grade engineering. Legendary Kleinn Performance.
Too Loud? Too Bad!
Air Horn Specifications
|
Quad Black Air Horns |
|
|
|
Part Number |
Model 141-1 |
|
|
Number of Horns |
4 Horns (Single Mount) |
|
|
Warranty |
1-Year Warranty |
|
|
Construction |
XCR2.0 Black Coated Stainless Steel |
|
|
Vortex 4 Chrome 12v Solenoid |
P/N- 307 w/ ¼” Airline Input |
|
|
Min / Max Pressure |
120 - 150 PSI |
|
|
Output (dB) @ 150 PSI |
150.3 dB |
|
|
Dimensions |
14” L x 6” W x 6.5” H |
|
|
Minimum Tank Size |
0.5-Gallon |
|
|
Airline Length and Size Included |
12’ of 1/4" OD Airline |
|
Air Compressor Specifications
|
12-Volt Light-Duty Compressor |
|
|
Part Number |
Model 6270RC |
|
Warranty |
1-Year |
|
Max Pressure |
130 PSI |
|
Duty Cycle |
25% @ 100 PSI (@ 72° F) |
|
Flow Rate |
@ 0 PSI (13.8 Volts): 1.56 CFM |
|
Compressor Type |
Waterproof Sealed, Oil-less |
|
Voltage |
12-Volt DC |
|
Motor Type |
Permanent Magnetic Motor |
|
Max Tank Size |
0.5 Gallon |
|
Max Amp Draw |
14 Amps |
|
Dimensions |
6.4” L x 3.5” W x 4.6” H |
|
Mounting Holes |
6.14” L x 2.76” W (5mm Diameter) |
|
Mounting Note |
Mount in any position except upside down |
|
Shipping Weight |
7 lbs |
|
Pressure Switch/ Safety Valve HK1-HK2 |
P/N 2121 (Pair w/ 52145 for 120 PSI kits) |
|
Pressure Switch/ Safety Valve HK3-HK4 |
P/N 2131 (Pair w/ 52155 for 130 PSI Kits) |
Air Tank Specifications
|
1-Gallon Air Tank |
|
|
Part Number |
Model 6270RT |
|
Warranty |
1-Year |
|
Tank Capacity |
1.0-Gallon |
|
Construction |
All Steel Design (Gloss Black Epoxy Finish) |
|
Internal Coating |
Internal Cortec Coating for Corrosion Resistance |
|
Mounting Legs |
1 Leg w/ 2 Mounting Points |
|
Air Tank Ports |
5 - 1/4" NPT Ports |
|
Mounting Hardware |
Fitting Pack - 2 Bolts, Nuts, Washers |
|
Max Pressure |
150 PSI |
|
Dimensions |
11” L x 6” W x 8” H |
Air Tank Fill Rate Details
|
Tank Capacity |
Tank Pressure Range |
Tank Fill Rate |
|
.5 Gallon |
0 - 150 PSI |
1 Min. 11 Sec. (+/- 5 Sec.) |
|
.5 Gallon |
110 - 150 PSI |
26 Sec. (+/- 3 Sec.) |
|
1 Gallon |
0 - 150 PSI |
1 Min. 57 Sec. (+/- 10 Sec.) |
|
1 Gallon |
110 - 150 PSI |
38 Sec. (+/- 5 Sec.) |
Installation Instruction Links:
Compressor Overview & Instructions

$439.95