The 9 Best Air Horns For Trucks
Updated by · How we research
Nine truck air horns compared by air supply, tank size, sound and fit, from bolt-on electric horns to full train-horn kits. The HornBlasters Flatlaw 3L leads. When users buy our independently chosen editorial picks, we may earn commissions to help fund the Wiki.
A train horn is only as good as its air supply, and a small tank empties in a few seconds of honking. This page is for pickup, SUV and semi owners who want more than a stock beep, whether that means a complete kit with its own compressor or horns for a truck that already carries air.
From the manual
- Mounting the air unit outside, or anywhere weather reaches it, voids the warranty, and it must stand upright. p. 1
- Change the compressor's intake filter every two to three months, or it pulls in dust and wears out early. p. 7
- Powering the relay from the supplied toggle instead of an ignition-switched fuse? Switch it off with the truck, or the compressor can drain the battery. p. 9
- Drain the tank at least every two weeks; trapped water makes the horns squeak and can kill the pressure switch. p. 11
From the manual
- The compressor must stay upright and in an enclosed spot, even when it goes in the engine bay. p. 5
- Water drains through a plug under the tank that comes out with a 10 mm wrench; re-tape its threads before refitting. p. 6
- An optional key-fob remote, part HB-RC, can sound the horn from up to 300 feet away. p. 4
Compare the specs
Swipe the table sideways to see every column.
| Product | Air supply in the box | Pressure (PSI) | Warranty |
|---|---|---|---|
| 1. HornBlasters Flatlaw 3L | 3 L tank + compressor | 90 on, 120 off | 2 years |
| 2. HornBlasters Rage | 3 L tank + compressor | 90 on, 120 off | 2 years |
| 3. Grand General 69991 | None; bring your own | Horn runs on 70-140 | 6 months |
| 4. HornBlasters Conductor's Special 228H | 2 gal tank + compressor | 110 on, 145-150 off | Horns lifetime, rest 2 years |
| 5. Vixen VXO8330 | 3 gal tank + compressor | 170 on, 200 off | 1 year |
| 6. VEVOR 4 Trumpet | 0.8 gal tank + compressor | 90 on, 120 off | — |
| 7. Kleinn 102-1 | None; 0.5 gal tank minimum | Horn needs 120-150 | 1 year |
| 8. Wolo 419 Bad Boy | Built-in compressor, no tank | — | 3 months |
| 9. Gampro Single Trumpet | — | — | — |
Pressure is where the compressor switches on and off for kits with a tank, or the supply a horn-only set needs. All values come from the makers' spec pages and manuals; a dash means the maker publishes none we could find.
Sources
- HornBlasters Flatlaw train horn kit 4-Chime (Rage) air horn kit Conductor's Special kits
- Grand General 69991 train horn
- Vixen Horns VXO8330/4124B kit Warranty
- VEVOR 4-trumpet kit, HS-550
- Kleinn Model 102-1
- Wolo Model 419 Bad Boy 419 and 519 instructions
From the manual
- A remote air filter on 6 feet of line is included; mount it high and dry, since a wet filter lets water into the compressor. p. 6
- Cut the four horn lines to equal length, or the bells sound at slightly different times. p. 8
- The air valve only works one way: its arrow must point toward the horns, or air leaks to them constantly. p. 8
- The bells ship tuned to a locomotive chord, and turning their tuning screws voids the warranty. p. 13
HornBlasters Conductor's Special 228H installation manual (PDF)
From the manual
- The compressor runs to the battery through a 20-amp switch and 20-amp fuse on 14-gauge wire, and the switch isn't in the box. p. 7
- Mount it level in a cool, dry place, and keep water off the compressor motor. p. 4
- If the thermal cutout trips, switch off and let the compressor cool for about 20 minutes before using it again. p. 9
From the manual
- Angle the trumpets slightly downward when you can, so water can't collect inside them. p. 1
- The valve's two red wires aren't polarized: one goes to the horn button's 12-volt output, the other to clean ground. p. 1
- Seal the wire splices with tape or silicone; if they corrode, the valve stops working. p. 1
From the manual
- Mount it upright where possible, somewhere dry and away from exhaust heat; it needs one 5/16-inch hole. p. 1
- On a two-wire factory horn, if the motor runs but no sound comes out, swap the two wires. p. 1
- Adding a separate horn button? The relay is included, but the button and the 20-amp fuse are not. p. 1
- The printed warranty lasts three months, and a claim needs proof of purchase plus a check for return shipping. p. 1
Editor's Notes
November 5, 2026, by Ezvid Wiki Editors:
We read the HornBlasters, VEVOR, Wolo and Kleinn instructions for six of the nine picks and added a spec table and notes from those manuals. HornBlasters rates the Flatlaw's small tank at two to three seconds of honking, not three or four, so we corrected that and the tank advice in the guide. We also fixed the wiring advice for tank kits, whose horn button opens the air valve rather than switching the compressor, and noted that California's 2010 horn-loudness bill was vetoed.
October 23, 2026, by Ezvid Wiki Editors:
The HornBlasters Flatlaw 3L is the new pick to beat. It gives a real train-horn chord from a kit that lies flat, so it fits trucks where a tall cluster won't, and it comes with everything needed to install it.
Half of the old list had faded away. Both Marco horns are no longer sold, the Wolo Chief is out of stock, and the Wolo Siberian Express was down to its last few units with a short warranty. We swapped the Vixen Quad, which needs its own air, for Vixen's complete kit. The Grand General 69991, Kleinn 102-1, Wolo 419 Bad Boy and Gampro Single Trumpet stay.
New are the HornBlasters Rage for low mounting spots, the HornBlasters Conductor's Special 228H for people who want the full locomotive sound, and the VEVOR 4 Trumpet for tight budgets.
One warning about the numbers. Almost every decibel figure printed on these boxes comes from the seller, and some are simply impossible for a horn this size. A magazine roundup listed the Flatlaw at about 110 decibels, far under what many cheap kits claim. So we ranked on what can be checked: what's in the kit, tank size, pressure ratings and warranty terms, and we treat every loudness claim as marketing.
Earlier notes
December 4, 2020, by Jeff Newburgh:
As mentioned previously, exercising common sense and safety is still paramount when installing one of these air horns onto your vehicle. Be aware of those around you, use them at your discretion within reason, and always drive responsibly.
Newly added this year is the Gampro Single Trumpet due to its affordable price point and redesigned compressor with a copper coil and vacuum chrome plating. This one also comes with an 80-amp safety relay.
Albeit pricey, we've also included the powerful Vixen Train Kit for its 200-PSI output, three-gallon air tank, sturdy leader hose with check valve for preventing backflow and leakage, and integrated thermal overload protection.
Thanks to its compact design, the Marco Tornado is a good option for small vehicles and it can also maintain its performance in temperatures as low as zero degrees Fahrenheit.
August 29, 2019, by Jeff Newburgh:
Always check your state's vehicle code to make sure the horn you choose is legal for use on the streets and highways. Use discretion, as these things get pretty darn loud, so they should only be used when necessary and not as a means of taunting or scaring other drivers for fun.
If you've ever driven a large truck, you're probably aware of all the noise and commotion around you. Drivers will change lanes without signaling, they might try to cut you off, and it's almost certain that they'll honk to make themselves heard. When you add high-velocity truck travel into the equation, you'll need something more than a conventional car horn to get your point across to those other drivers. Think air horn, but on a larger and louder scale and with a specific purpose of making your presence known amidst a sea of smaller vehicles. Since a truck is generally loud on its own, you'll need an air horn designed specifically for that vehicle that's capable of producing enough sound to carry over all that other noise. Our list includes several models that simulate the sounds coming from fire engines, ambulances, and even train horns.
For example, the three chrome-plated brass trumpets on the Grand General Heavy Duty produce a sound reminiscent of the horn from a large locomotive at more than 140 decibels. [2026 update: the 140-decibel figure is Grand General's own claim; we know of no independent measurement of it.] I also added the Wolo Chief for its slender design and front pedestal for reducing vibrations when driving at high velocity. As one of the least expensive options, the Zento Single is compatible with a variety of vehicles and comes with everything you need to make your truck heard, including a powerful, bright red air compressor. The stacked design of the Vixen Quad not only looks cool, but the all-metal construction allows it to withstand extreme weather conditions. I also included the Kleinn HK2 for its half-gallon air tank, 30-second sound blast, and ease of installation under most hoods. The one-piece design of the Wolo Bad Boy eliminates the need for additional hose attachments, while the compact size allows it to fit inside most engine compartments. The Marco Extreme Blast is one of the few options that comes with dedicated air compressors for both of its horns, and it can also be installed in most cars and SUVs. Finally, the ABS construction on the Wolo Siberian Express provides a lightweight design and dependable rust resistance, while its long horns deliver a deep and rich tone.
Special Honors
HornBlasters Nathan Airchime Kits Nathan Airchime horns are the kind fitted to many North American locomotives, and HornBlasters builds truck kits around its K3, K5, P3 and P5 models. These are far bigger, heavier and costlier than ordinary truck kits, and they need a large tank and a solid mounting plan. They suit show trucks and serious train-horn fans who want the real thing. hornblasters.com
Kleinn Vehicle-Specific Systems Kleinn, a U.S. air horn maker, sells train-horn and onboard-air systems made to bolt into set spots on particular Ford, GM, Jeep, Ram and Toyota trucks. They cost more than a universal kit, but they take the guesswork out of finding room for the tank and horns. Kleinn sells through dealers and its own site. kleinn.com
Complete Kit, Horn Only Or Bolt-On
A compact electric air horn puts a tiny compressor and short trumpets in one unit with no tank.
Air horns for trucks come in three kinds, and the right one depends on where your air will come from.
A complete kit brings its own 12-volt compressor, a tank, a valve and wiring. This is what most pickup and SUV owners need. HornBlasters, for example, sells every kit in its range with the horn, the air system and the hardware to install it (HornBlasters). Tank size matters more than most buyers expect, and bigger horns drink more air. HornBlasters rates its three-liter kits at two to five seconds of honking per fill, depending on the horn (Flatlaw, 4-Chime), its two-gallon kits at three to five, and its five-gallon kits at 10 to 12 (Conductor's Special).
A horn-only set is just trumpets and a valve. It makes sense if your truck already has onboard air for tires or air suspension, or if you drive a semi with air brakes. Kleinn sells horn-only sets alongside vehicle-specific systems built for particular Ford, GM, Jeep, Ram and Toyota models (Kleinn).
A compact electric air horn puts a tiny compressor and short trumpets in one unit with no tank. It bolts in where the stock horn was and sounds louder and richer, but it won't sound like a train. Wolo, for one, says its one-piece Bad Boy installs by moving the factory horn wires over to its compressor (Wolo).
Installing Without Regrets
Most kits go in with hand tools, but a few steps decide whether the horn still works next winter.
A tank kit runs on two separate circuits. The horn button only opens the air valve. In HornBlasters' three-liter kits, the compressor gets its own fused line from the battery through a relay that switches on with the ignition, so it can't run while the truck sits parked; wire that relay to a manual toggle instead and you must remember to turn it off (HornBlasters manual). One-piece electric horns are simpler, with one circuit from the horn button to the compressor, often through a relay. Check what's in the box before you start: VEVOR's budget kit, for one, leaves out the power switch.
Mount the compressor and tank where water and road salt can't reach them. HornBlasters says its compact M3 air unit is not weather resistant and should sit upright in a dry, enclosed spot, such as inside the cab or a bed box. Seal threaded air fittings with thread sealant and check every joint for hissing with soapy water once the tank is full.
Small 12-volt compressors are built to run in short bursts. Holding the button down, or blasting again and again, can overheat them. Vixen's kit compressor has a thermal cutoff for this reason (Vixen Horns). Drain water from the tank on a schedule: HornBlasters says at least every two weeks, because trapped water makes horns squeak and can ruin the pressure switch.
On a truck with air brakes, adding a horn to the brake air system is a job for a qualified mechanic. A leak there affects more than the horn. Grand General, which makes trumpets for big rigs, sells its horns through truck parts dealers (Grand General).
Is A Train Horn Legal, And How Loud Is Too Loud
There's no single U.S. rule for horn loudness. Federal rules for commercial trucks only require a horn that gives an adequate and reliable warning (49 CFR 393.81). States set the rest. California's vehicle code, for example, requires a horn audible from at least 200 feet but bans one that is unreasonably loud or harsh, and a 2010 bill that would have capped aftermarket horns at 110 dB(A) (California AB 2245) was vetoed, so that cap never became law (Assembly final history). Read your own state's code before using one on public roads, and keep the stock horn working for everyday driving.
Local noise ordinances apply too, especially near homes, schools and hospitals.
Treat decibel claims with suspicion. Cheap kits often print 150 dB or more on the box, while a magazine roundup listed one well-regarded compact kit at about 110 dB. Either way, these horns can hurt hearing. The National Institute on Deafness and Other Communication Disorders says long or repeated exposure to sounds at or above 85 dBA can cause hearing loss, and louder sounds do harm faster (NIDCD). Never sound a train horn close to people or animals, and wear earplugs while testing your install.
How we researched this
We compared 18 air horns and kits and narrowed them to these nine. We read HornBlasters' installation manuals for the Flatlaw 3-liter, the 2/4-Chime 3-liter kit the Rage belongs to and the Conductor's Special 228H, VEVOR's HS-series instructions, Wolo's Bad Boy sheet and Kleinn's solenoid wiring sheet, plus every maker's spec page except Gampro's, which we couldn't find. MotorTrend's train-horn roundup supplied the one outside loudness figure we cite, and the federal horn rule, California's horn law and the NIDCD's hearing guidance shaped the legal and safety advice. A search of the CPSC recall database on November 5, 2026, found no recalls for HornBlasters, Grand General, Vixen, Kleinn, Wolo or Gampro, and VEVOR's eight recalls all cover unrelated goods such as baby gates and steamers.
Sources (22)
- HornBlasters: complete kits
- Kleinn: air horns
- Vixen Horns
- Grand General
- MotorTrend: The Best Truck Train Horns
- 49 CFR 393.81: Horn
- California AB 2245 (2010), enrolled text
- NIDCD: Noise-induced hearing loss
- CPSC recalls database
- HornBlasters: instruction manuals
- HornBlasters: Flatlaw train horn kit
- HornBlasters: 4-Chime (Rage) air horn kit
- HornBlasters: Conductor's Special kits
- Grand General: 69991 heavy duty train horn
- Vixen Horns: VXO8330/4124B kit
- Vixen Horns: warranty
- VEVOR: 4-trumpet train horn kit (HS-550)
- Kleinn: Model 102-1
- Kleinn: solenoid valve wiring instructions
- Wolo: Model 419 Bad Boy
- Wolo: 419 and 519 Bad Boy instructions
- California Assembly final history, 2009-10 (AB 2245 veto)
Frequently asked questions
Are train horns legal on trucks?
It depends on the state. Most state codes require a working horn but ban unreasonably loud or harsh ones, and local noise rules apply too. Keep the stock horn for daily use and check your state's code first.
How loud is a truck train horn?
Makers claim 140 to 150 decibels or more, but independent measurements are rare. A magazine roundup listed one compact kit at about 110 decibels. Either way, it's loud enough to hurt hearing at close range.
Do I need an air tank?
For a true train-horn sound, yes. The tank stores air so the horn can blast at full strength. A small tank gives a few seconds of sound per fill. Compact electric air horns skip the tank but sound much smaller.
Can I use my truck's stock horn button?
Yes, in most kits. The stock horn wire, often through the kit's toggle switch, opens the air valve, while the compressor runs on its own separate circuit. On some vehicles the stock horn wire carries constant power, and HornBlasters' manual gives a fix for that.
Is an air horn for protection the same thing?
No. Handheld canister air horns, sold for boating, sports and personal safety, use a can of compressed gas and fit in a pocket or bag. The horns on this page mount on a vehicle and run on its electrical system.
