- +Genuinely cheap: $52.99 direct, ~$42 at Walmart
- +Self-contained — no tank, no pressure switch, minimal space
- +Publishes real chord frequencies (410/440 Hz) and full electrical specs
- +30-amp relay included for the 16-amp draw
- +Maintenance-free compressor with replacement parts sold separately
- +Established US brand with toll-free tech support
- −120 dB claim has no disclosed test distance
- −10-12 PSI direct drive can't approach tank-fed train horn output
- −Red plastic trumpets look budget, not truck-grade chrome
- −No warranty terms published on Wolo's site for this model
- −Spec tab on Wolo's migrated site contradicts trumpet material
- −Blast length limited by compressor — no stored air
Methodology
This review aggregates publicly available information from manufacturer specifications, retailer listings, and verified user reviews. We do not perform hands-on testing. Last reviewed: August 7, 2026. Our primary source is Wolo’s official Model 417 product page, cross-checked against Walmart, JEGS, and Northern Tool listings plus a public YouTube sound demo. One documentation note: Wolo migrated its website in mid-2026, and the new product page’s spec tab lists the trumpet material as “metal chrome plated” while the product description — and the packaging itself — clearly describe two red plastic trumpets. We treat the description and packaging as authoritative and flag the spec-tab line as a migration error.
Quick verdict
The Wolo 417 Long Horns is a $52.99 self-contained dual air horn, not a train horn — and as long as you understand that distinction, it delivers exactly what it promises. You get two long red plastic trumpets, a maintenance-free 12-volt compressor the size of a soda can, and a claimed 120 dB “big rig” dual tone with no air tank, no pressure switch, and no gallon of trunk space sacrificed. We rate it 3.5/5: it is one of the most honest products in the budget air horn segment (real frequencies published, modest dB claim, complete electrical specs), but 120 dB at 10–12 PSI is a fraction of the acoustic energy of a genuine tank-fed train horn kit. Buy it as a big upgrade over a stock horn, not as a neighbor-rattling showpiece.
What it is
The Model 417 Long Horns is one of Wolo’s longest-running self-contained air horn kits. “Self-contained” means the box holds everything the horn needs: two red plastic trumpets (the longer one measuring 9-1/4 inches), a compact chrome-plated 12-volt compressor, a 30-amp relay, connecting hose, and mounting hardware. There is no air tank to mount and no separate air system to build — the little compressor feeds the trumpets directly at 10–12 PSI the moment you hit the button.
Wolo has been in business since 1965 and is headquartered in Deer Park, New York; the 417 sits in the entry tier of its air horn line, below tank-based systems like the Siberian Express and the Philly Express PRO. The target buyer is someone with a car, pickup, SUV, boat, or tractor who wants a louder, deeper dual-tone blast than any stock electric horn can make, with an installation that takes an afternoon and a budget around fifty dollars. Per Wolo’s product page, the horn “produces a powerful big rig truck sound” — a high tone and a low tone sounding together, which is what separates it from single-note novelty horns. A 24-volt version (Model 417-24) exists for commercial trucks and equipment, with an 11-amp draw instead of 16.
If you are comparing formats before buying, our tankless train horns guide explains what a direct-drive compressor can and cannot do, and our train horn vs air horn comparison covers why kits like this occupy a different class from true train horns.
Specifications
| Spec | Value |
|---|---|
| Model | Wolo 417 Long Horns (12-volt) |
| Sound output | 120 dB (test distance not disclosed) |
| Frequencies | 410 / 440 Hz — low range, dual tone |
| Trumpets | 2, red plastic; longest 9-1/4 in. |
| Compressor | Chrome-plated, maintenance-free; 2-1/4 in. dia × 4-1/2 in. H |
| Operating pressure | 10–12 PSI (direct drive, no tank) |
| Voltage | 12 V (24 V version: Model 417-24) |
| Current draw | 16 A (relay-switched) |
| Relay | 30-amp relay included |
| Kit weight | 5 lbs |
| Package dimensions | 17 × 4 × 8 in. |
| Price | $52.99 direct from Wolo; ~$42 at Walmart |
| Instructions | English / Spanish (French PDF on Wolo’s site) |
Two spec-sheet observations. First, Wolo publishes its dB number without a test distance, so treat 120 dB as a manufacturer claim rather than a comparable measurement — our decibels guide explains why distance changes everything. Second, publishing the actual chord frequencies (410/440 Hz) is more transparency than most budget brands offer; that low-range pairing is what produces the “truck horn” character instead of a thin beep.
What’s in the box
- Two red plastic trumpets with mounting bases (longest: 9-1/4 in.)
- Compact chrome-plated 12-volt compressor (2-1/4 in. dia × 4-1/2 in. H), maintenance-free
- 30-amp relay
- Connecting hose
- Mounting hardware for trumpets, compressor, and hose
- Installation instructions in English and Spanish
Wolo also sells the compressor, relay, and mounting hardware as replacement parts on its site — a small but real advantage over no-name imports where a dead compressor means a dead kit.
Pros
- Genuinely cheap: $52.99 direct from Wolo, listed near $42 at Walmart
- True self-contained design — no tank, no pressure switch, minimal space needed
- Published chord frequencies (410/440 Hz) and full electrical specs, rare at this price
- 30-amp relay included in the box, so the 16-amp draw never touches your horn button wiring
- Maintenance-free sealed compressor with replacement parts available separately
- Established US brand (Wolo, Deer Park, NY, since 1965) with a toll-free tech line
Cons
- 120 dB claim carries no test distance, so it can’t be fairly compared against honestly measured horns
- 10–12 PSI direct drive is a fraction of the output of a 120–150 PSI tank-fed train horn system
- Red plastic trumpets look like a marine/novelty horn, not a chrome truck horn
- Wolo’s new website lists no warranty terms for the 417 as of this review
- Spec tab on the migrated product page contradicts the description on trumpet material
- Sound duration is compressor-limited — no stored air means no long, sustained blasts
Alternatives
- Wolo Bad Boy 419 — Wolo’s one-piece compact self-contained air horn: lower profile, all-black, easier to hide under the hood, similar output class. See our Wolo Bad Boy 419 review.
- Wolo 845 Road Warrior DD — a roof-mount self-contained option with a visible chrome trumpet for trucks that want the look as well as the sound. See our Wolo 845 Road Warrior DD review.
- Kleinn HK2 — the step up in kind, not just degree: a compact dual ProBlaster train horn with a real onboard air system, several times the acoustic energy at several times the price. See our Kleinn HK2 review.
More Wolo coverage lives on our Wolo reviews hub.
Install / compatibility notes
The 417 is about as simple as an air horn install gets, which is much of its appeal:
- Mount the two trumpets facing forward, angled slightly down so water drains out of the bells — behind the grille is typical.
- Mount the compressor upright on a flat surface in the engine bay, away from direct exhaust heat, and connect the hose to the trumpets.
- Wire the included 30-amp relay: battery positive to the compressor through the relay contacts, trigger wire to your horn circuit or a dashboard button, and a solid chassis ground.
The 16-amp draw is the one number to respect. That is far beyond what a stock horn circuit is designed to carry, which is exactly why Wolo ships a relay in the box — use it, fuse the power lead near the battery, and see our relay wiring guide for the full diagram. Any 12-volt vehicle is fair game: cars, pickups, SUVs, RVs, boats, vans, and tractors per Wolo’s listing. Commercial trucks and 24-volt equipment should order the 417-24 variant instead. Because the compressor is the sound source, there is no tank to drain in winter and no moisture management to think about — the trade-off is that every blast lasts only as long as the compressor keeps spinning. In the public YouTube demo we reviewed, the tone comes across as a genuine dual-note truck blast, noticeably deeper than an electric horn, though clearly shorter and thinner than a tank-fed system.
Sources
- Wolo — Model 417 Long Horns 12-Volt product page — all core specs: 120 dB, 410/440 Hz, trumpet count and length, compressor size and PSI, 16-amp draw, 30-amp relay, kit contents, $52.99 price, 5-lb weight, replacement parts, packaging photo
- Wolo — Model 417-24 Long Horns 24-Volt product page — 24-volt variant existence and 11-amp current draw
- Wolo Manufacturing — official site — company founding (“since 1965” banner) and toll-free customer support line
- Walmart — Wolo 417 Long Horns Air Horn listing — ~$41.98 street price reference
- JEGS — WOLO 417 Long Horns Air Horn listing — retailer confirmation of red plastic trumpets and availability
- Northern Tool — Wolo Long Horn Air-Powered Horns Model 417, item 331033 — retail availability cross-check
- YouTube — “Wolo (417) Long Horns Big Rig Sound - 12 Volt, Low and High Tone” — public sound demo of the dual tone
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
An honest $53 self-contained dual air horn that gives any 12-volt vehicle a real big-rig-style tone without a tank or complex install — just don't expect anything close to true train horn volume.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Wolo 417 Long Horns really?
- Wolo rates it at 120 dB but does not disclose the test distance, so treat the number as a manufacturer claim. It is clearly louder and deeper than a stock electric horn, but well below tank-fed train horn kits that operate at 120-150 PSI.
- Does the Wolo 417 need an air tank or compressor system?
- No. The 417 is fully self-contained: its small chrome 12-volt compressor (2-1/4 in. diameter by 4-1/2 in. tall) feeds the two trumpets directly at 10-12 PSI. Everything needed — compressor, relay, hose, and hardware — is in the box.
- Will the Wolo 417 work on my car's stock horn wiring?
- Not directly — the compressor draws 16 amps, far more than stock horn circuits are built for. Wolo includes a 30-amp relay in the kit; wire the compressor through the relay with a fused lead from the battery, using the stock horn wire only as the trigger.
- Are the Wolo 417 trumpets metal or plastic?
- The two trumpets are red plastic, per Wolo's own product description and the retail packaging; the longest measures 9-1/4 inches. A spec line on Wolo's redesigned website says 'metal chrome plated,' but that appears to be a site-migration error — the chrome-plated part is the compressor.
- Is there a 24-volt version of the Wolo 417?
- Yes. The Model 417-24 is the same dual-trumpet kit built for 24-volt trucks and equipment, with an 11-amp current draw instead of the 12-volt model's 16 amps.
