Riding my Street Glide, I quickly realized the stock horn sounded less like a serious warning and more like a sad squeak. That realization sent me down the path of finding the best harley air horn system that actually makes cagers look up from their phones. In this comprehensive guide, we’ve broken down seven of the top systems—from bolt-on kits specifically engineered for Hogs to universal 150dB beasts—focusing on installation ease, decibel rating, and real-world safety benefits.
Contents
- Hadley Manufacturing H00977AD Air Horn
- Kleinn Air Horns HOGKIT-1 Direct Drive Horn System
- FARBIN Air Horn for Motorcycle Train Horns for Car Truck 150DB Super Loud Car Horn 12V with Button Compatible with Motorcycle with Horn Cover (12V, Silver Shell with Button)
- Cenzhiwen Motorcycle Air Horn Kit 12V 150db Super Loud Car Horn, with Air Compressor and Wiring Harness, Suitable for Any 12V Vehicle/Train/Truck/Motorbike/Boat/Pickup (silvery with button)
- ProBEAST Dual Tone Motorcycle Air Horn – Black
- ProBEAST Dual Tone Motorcycle Air Horn – Chrome
- Super Loud Train Horns, Car Waterproof Durable Air Electric Snail Horn, 12V Raging Sound Air Horns Replacement Kit, Automotive Accessories Universal for Car, Motorcycle, Truck, Bike, Boat (Silver)
- Comparison Insights: Choosing Your Loudness Level
- Final Verdict: Our Top Recommendations
- Frequently Asked Questions About Best Harley Air Horn
- How much louder is an air horn compared to a stock Harley horn?
- Are 150dB “train horns” legal for motorcycle use?
- Do air horns draw too much power for a motorcycle electrical system?
- What is the difference between an air horn and an electric snail horn?
- Where is the best place to mount a compressor on a Harley?
- Can I install an air horn without professional help?
Hadley Manufacturing H00977AD Air Horn
While Hadley is often recognized for commercial trucking applications, the H00977AD offers incredibly robust, reliable sound for custom motorcycle builders willing to fabricate mounts. This is a durable, professional-grade air horn designed for maximum volume and longevity. It operates on existing air systems (or a custom air tank installation) and provides the deep, powerful tone you expect from a premium truck horn. Note that this specific unit requires purchasing the pedestal kit separately and may require fabrication if mounting to a Harley.
Key features that stand out:
– Professional Grade: Designed for extreme duty and reliability.
– Cross-Reference Compatibility: Replaces several major truck manufacturer part numbers (Volvo 3082417, 63001-0008, etc.).
– Unbranded Finish: Horn is plain and does not have the Hadley logo for a cleaner, custom look.
Pros:
– Extremely durable and robust construction.
– Delivers a true, deep air horn tone, unlike electric “mini” horns.
– Ideal for custom baggers with onboard air systems.
Cons:
– Installation requires significant custom work and additional parts (pedestal kit, air source).
Best for: Custom builders and riders with existing onboard air systems who prioritize massive, non-electric sound.
Expert Opinion: This is a component, not a kit. If you already run air ride or have a compressor and tank setup on your bike, this provides the highest quality sound output available, but don’t expect a plug-and-play installation.
Kleinn Air Horns HOGKIT-1 Direct Drive Horn System
The Kleinn HOGKIT-1 is the answer for Harley riders who hate modification. This system is an expertly engineered 100% bolt-on, direct-drive dual air horn system designed specifically for most Harley Davidson models from 1978 to current. You get massive air horn sound without needing a separate air tank, thanks to the powerful, compact, direct-drive compressor included, which is perfect for tight motorcycle spaces. The fact that the custom bracket is proudly made in the USA ensures quality fitment that replaces the stock cowbell horn cover directly.
Key features that stand out:
– Harley Specific Fitment: Expertly Engineered for most Harley Davidson Motorcycles from 1978 to Current.
– Zero Fabrication: Offering a One Hundred Percent Bolt On installation.
– Tank-Less Operation: Includes a powerful, compact, tank-less Direct-Drive Compressor.
– Made in the USA: Featuring a Custom Bracket Proudly Made in the USA.
Pros:
– True air horn sound without requiring complex tank mounting.
– Bolt-on design minimizes installation headaches specific to Harley models.
– All necessary hardware, instructions, and relay are included.
Cons:
– Higher price point compared to universal kits.
Best for: Riders seeking a genuine air horn sound with the easiest possible installation on their Harley.
Expert Opinion: Kleinn delivers on their promise of simplicity. While the initial wiring of the relay might take an hour, the mechanical installation is genuinely straightforward due to the custom, American-made bracket system, making this one of the best harley air horn kits for average riders.
FARBIN Air Horn for Motorcycle Train Horns for Car Truck 150DB Super Loud Car Horn 12V with Button Compatible with Motorcycle with Horn Cover (12V, Silver Shell with Button)
If maximum volume is your primary goal, the FARBIN 150dB system delivers shock and awe. This universal kit is marketed as a train horn for motorcycles, promising super loud sound that can reach 150dB at two meters. It features a unique, aerodynamic design with a silver shell and includes its own horn button, relay, and wiring harness, meaning you don’t need to tap into the existing horn circuit if you prefer a separate control. The upgrade air pump uses thickened red copper coil and is built to withstand harsh weather conditions.
Key features that stand out:
– Extreme Loudness: Super Loud Horn reaching 150dB.
– All-in-One Kit: Includes fixing screws, relay harness, fuse, and a separate button.
– Durable Construction: Upgrade air pump designed for over 100,000 consecutive uses.
– Personalized Design: Unique appearance conforms to aerodynamics and body decoration style.
Pros:
– Incredible volume level ensures maximum attention.
– Comprehensive kit includes everything needed for installation (including a button).
– Compact size allows for flexible installation location on various bikes.
Cons:
– Requires finding a place to mount the large snail-shaped horn unit and compressor.
Best for: Riders who prioritize the absolute loudest sound and don’t mind a slightly more complex, universal wiring install.
Expert Opinion: 150dB is serious volume—definitely overkill for neighborhood cruising, but essential for heavy interstate travel. The fact that it comes with a dedicated button means you can run this alongside your stock horn (one for polite toots, one for emergencies).
The Cenzhiwen kit offers almost identical sound specifications to the FARBIN model, focusing on ease of use and maximum decibels. Reaching 150dB, this horn is critically important for collision prevention in high-speed riding. What sets this kit apart is the emphasis on a 30-MINUTE QUICK INSTALL—it’s advertised as a complete plug-and-play kit with the compressor and wiring harness integrated. The weatherproof housing and vacuum-chromed brass coils on the compressor promise longevity and reliability, even in unfavorable riding conditions.
Key features that stand out:
– Max Volume: 150dB Super Loud Horn for maximum safety.
– Quick Install: Advertised as a 30-minute complete plug-and-play kit.
– Weatherproof: Upgrade air pump features waterproof housing and vacuum-chromed brass coils.
– Universal Fit: Compatible with Harley motorcycle horns and nearly any 12V system.
Pros:
– Outstanding loudness for highway use.
– Simple installation process due to the comprehensive plug-and-play harness.
– Durable, weatherproof construction is ideal for motorcycle use.
Cons:
– Requires space for both the compressor and the large horn unit.
Best for: The rider who wants 150dB volume but needs the easiest possible setup, making installation time a priority.
Expert Opinion: Both the Cenzhiwen and FARBIN systems are exceptionally loud. Choose Cenzhiwen if you value the highly integrated harness for potentially faster, cleaner wiring connections. It’s a very cost-effective way to get a powerful air horn.
ProBEAST Dual Tone Motorcycle Air Horn – Black
The ProBEAST Dual Tone horn offers a fantastic blend of increased safety and clean aesthetics. While not reaching the extreme volume of the 150dB kits, its 104.9dB (at 2 meters) output is dramatically louder than any stock Harley horn and provides a piercing dual-tone sound designed for road use. The key benefit of this unit is its Plug-and-Play Installation and durable ABS plastic cover, which mimics the look of a traditional Harley horn cover, keeping your motorcycle looking custom and neat.
Key features that stand out:
– Measured Loudness: 104.9db (at 2 meters).
– Ease of Install: True Plug-and-Play Installation.
– Aesthetic Integration: Durable ABS Plastic Cover (5 7/8″ X 5 3/4″).
– Reliability: Backed by a 3 Year Warranty.
Pros:
– Easiest installation method—truly plug-and-play for most modern Harleys.
– Clean, integrated look with a custom black cover.
– Significantly louder and more effective than stock horns.
Cons:
– Less loud than the large train horn kits.
Best for: Riders looking for the simplest, cleanest upgrade that retains the classic Harley look while boosting safety.
Expert Opinion: If you are nervous about complex wiring, this is your best option. It’s a high-quality, durable electric horn that utilizes your existing wiring setup, providing immediate, noticeable improvement over the stock squeaker.
ProBEAST Dual Tone Motorcycle Air Horn – Chrome
Functionally identical to its black counterpart, the Chrome version of the ProBEAST Dual Tone Motorcycle Air Horn caters specifically to riders whose aesthetic requires shiny accents. It boasts the same impressive 104.9dB output and features the celebrated Plug-and-Play Installation system, minimizing downtime and wiring frustrations. This unit provides the necessary volume boost and safety enhancement while fitting perfectly into the established chrome ecosystem of many Harley models.
Key features that stand out:
– Classic Look: High-quality chrome finish on the durable ABS Plastic Cover.
– Sound Performance: 104.9db (at 2 meters) dual-tone frequency.
– Installation Simplicity: Plug-and-Play system for quick mounting.
– Warranty: Solid 3 Year Manufacturer’s Warranty.
Pros:
– Matches existing chrome accessories perfectly.
– Extremely simple, non-invasive installation.
– Reliable performance backed by a long warranty.
Cons:
– The plastic cover, while durable, doesn’t have the heft of a metal cover.
Best for: Harley owners with chrome accents who demand a straightforward, effective volume upgrade.
Expert Opinion: The ProBEAST series is excellent for riders who want the best harley air horn substitute that doesn’t involve compressors or air lines. Choose the finish that matches your bike; the function and quality are exactly the same.
Super Loud Train Horns, Car Waterproof Durable Air Electric Snail Horn, 12V Raging Sound Air Horns Replacement Kit, Automotive Accessories Universal for Car, Motorcycle, Truck, Bike, Boat (Silver)
This universal snail-style air electric horn offers a high-decibel output—claimed at up to 300DB (though real-world tests likely place it closer to 120-130dB, which is still incredibly loud). It’s notable because it doesn’t require a bulky external air compressor or complicated wiring; it’s an electric snail horn that produces a “raging sound.” Constructed from durable ABS polymer and high-quality carbon steel, it features high corrosion resistance and an easy-to-install universal mounting bracket.
Key features that stand out:
– Unique Design: Snail-style electric horn eliminates the need for a separate compressor setup.
– Durability: 100% waterproof ABS polymer and carbon steel construction with electrophoresis treatment.
– Simple Power: Only requires a 12V power supply connection.
– Wide Compatibility: Suitable for almost 98% of 12V vehicles.
Pros:
– Provides significantly louder sound than stock without a separate compressor unit.
– Highly corrosion-resistant and durable for all-weather riding.
– Installation is streamlined compared to traditional air horn kits.
Cons:
– The “300DB” claim is marketing hyperbole; actual loudness is high but not truly 300dB.
Best for: The budget-conscious rider who wants an immediate, very loud sound boost without dealing with air tanks or complex wiring harnesses.
Expert Opinion: This is a great intermediate step between a basic replacement horn and a full-blown air kit. It’s much louder than standard electric horns because of the snail design, and the minimal components make it easy to tuck away.
Comparison Insights: Choosing Your Loudness Level
When selecting the right system, the main differences lie in installation complexity, sound output, and whether the system is truly “air” or “electric.”
- Maximum Decibels: If you need ear-splitting volume, the FARBIN and Cenzhiwen 150dB kits are unmatched. However, they require finding space for the large horn unit and air pump.
- Harley-Specific Fitment: For the cleanest installation on most late-model Harleys, the Kleinn HOGKIT-1 is superior. It bolts directly on where the stock horn cover sits.
- Plug-and-Play Simplicity: The ProBEAST Dual Tone models (Black and Chrome) are hands-down the easiest to install, requiring minimal wiring knowledge and offering a clean, integrated aesthetic. They are ideal if you want a significant upgrade over stock without any fabrication or external compressor mounting.
- Custom Build Potential: The Hadley Manufacturing component is strictly for experienced mechanics or custom builders who are integrating the horn into an existing air system or fabricating mounts from scratch.
Final Verdict: Our Top Recommendations
After reviewing performance, installation effort, and rider feedback, we’ve identified the best harley air horn system based on three common rider needs:
Easiest Bolt-On Upgrade
The Kleinn Air Horns HOGKIT-1 wins this category. Its dedicated Harley design, coupled with the included direct-drive compressor, makes the installation process remarkably clean and professional, ensuring you get true air horn sound without permanent modification.
Highest Safety Volume (Universal)
If maximizing decibels is your main priority, the Cenzhiwen Motorcycle Air Horn Kit 12V 150db offers the most straightforward way to achieve train horn loudness. The integrated wiring harness advertised for the 30-minute install makes its high volume surprisingly accessible.
Best Combination of Sound and Aesthetics
The ProBEAST Dual Tone Motorcycle Air Horn series provides the best balance. It delivers a necessary volume increase (104.9dB) that’s effective on the highway, all while maintaining a sleek, factory-like appearance and offering truly plug-and-play installation.
Frequently Asked Questions About Best Harley Air Horn
How much louder is an air horn compared to a stock Harley horn?
Stock Harley horns typically produce sound in the range of 90-95 decibels (dB) at a short distance. A good electric air horn system, like the ProBEAST, hits around 105dB. Train horn kits can reach 150dB or higher. Because the decibel scale is logarithmic, a 10dB increase is perceived as twice as loud, meaning a 150dB horn is exponentially more effective at cutting through traffic noise than the stock unit.
Are 150dB “train horns” legal for motorcycle use?
The legality of very loud horns (often 150dB+) varies significantly by jurisdiction. Most states and countries have laws specifying the maximum allowable sound output for vehicle horns, typically around 110-120dB. While many riders install them for safety, using ultra-loud horns might violate local noise ordinances. It’s crucial to check your local vehicle code.
Do air horns draw too much power for a motorcycle electrical system?
Air horns and high-output electric horns require a significantly higher amp draw than the small stock horn. To handle this necessary current (which can sometimes peak at 20-30 amps for a split second), nearly all quality best harley air horn kits, including the Kleinn and the universal 150dB systems, require the use of a relay and a dedicated fuse wired directly to the battery. This prevents overloading the stock wiring harness.
What is the difference between an air horn and an electric snail horn?
A traditional air horn (like the Kleinn or Hadley) uses a separate, dedicated air compressor to push air through a trumpet or bell, creating a deep, resonant sound. An electric snail horn (like the Super Loud Train Horns) uses an internal motor and a diaphragm structure within the coiled “snail” shell to generate a very loud, penetrating sound without needing a separate air source or air lines.
Where is the best place to mount a compressor on a Harley?
For full air horn systems, finding space for the air compressor is the biggest challenge on a Harley. Common mounting locations include behind the saddlebag supports, underneath the swingarm (with caution for clearance), or tucked inside the fairing if you have a touring model. Dedicated kits like the Kleinn HOGKIT-1 often integrate the compressor directly where the stock horn cover sits.
Can I install an air horn without professional help?
Yes. Systems labeled as “Plug-and-Play,” such as the ProBEAST series, are designed for easy DIY installation and only require basic tools. Even kits requiring a relay and dedicated power (like the Kleinn kit) often include clear, motorcycle-specific instructions and all required wiring components, making it manageable for anyone comfortable with basic wiring concepts.
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