- +Complete all-in-one kit — four trumpets, 1.5-gallon tank, 150 PSI compressor, valve, gauge and switch in one box
- +Genuine four-trumpet chord layout for a fuller, more locomotive-like tone than two- or three-trumpet kits
- +Budget pricing undercuts most name-brand four-trumpet systems
- +Thermal-overload-protected compressor and brass fittings are reasonable hardware for the price
- +Universal-fit design works on trucks, SUVs, RVs and boats without vehicle-specific brackets
- −149 dB figure is published with no stated test distance, so it can't be compared apples-to-apples
- −No published chord frequencies (Hz), weight, or formal warranty terms
- −Small 1.5-gallon tank gives only a few full-volume blasts before the compressor must recover
- −Black-coated finish and economy fittings are not built for long-term corrosion resistance
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 June 20, 2026. The specifications below are drawn from Viking’s official product listing and current Amazon, Walmart and eBay listings for the V101C-3/4008B kit. Every figure we cite is listed in the Sources section at the end.
Quick verdict
The Viking Horns V101C is the brand’s entry-level four-trumpet train horn kit: four black-coated metal trumpets, a 1.5-gallon air tank, and a 150 PSI compressor, all bundled at a budget price point. For the money, you get more trumpets and a complete air system than most kits in this price bracket, and the chord it produces is genuinely loud and aggressive. We rate it 3.2/5. The score is held back not by the sound but by transparency: the 149 dB rating carries no test distance, and key specs like chord frequency and formal warranty terms are undisclosed. It’s a solid budget pick if you go in with realistic expectations.
What it is
The V101C (retailer SKU V101C-3/4008B) is a universal-fit aftermarket air horn kit aimed at trucks, pickups, SUVs, RVs and boats. “Train horn” here describes the format — multiple tuned trumpets fired by compressed air to mimic a locomotive’s chord — rather than any railroad certification. It is a complete system: you are not just buying horns, you are buying the trumpets, the air tank that stores pressure, the 12V compressor that fills the tank, and the electric valve that releases air when you press the button.
Four trumpets of graduated length sound four different notes simultaneously. That stacked chord is what gives a four-trumpet kit its richer, more “real train” character compared with the thinner two-note blast of a compact horn. If you want the fundamentals on why multiple trumpets create a chord, our train horn chord and tuning guide explains the acoustics.
This kit sits at the budget end of the four-trumpet market. It competes less with premium HornBlasters or Kleinn systems and more with other value brands like Vevor and Vixen — buyers cross-shopping it are usually optimizing for trumpets-per-dollar and loudness, not warranty paperwork. The trade-off is predictable: you get the trumpet count and the volume, but not the documentation, parts pipeline, or finish quality of a premium brand. For a lot of enthusiast builds that’s an acceptable bargain, and it’s exactly the buyer this kit is aimed at.
Who is it not for? Anyone who needs a documented, repeatable dB figure for a legal or commercial application, or anyone who wants formal published warranty terms. Treat it as a value consumer kit — buy it, install it well, and keep a spare solenoid on hand.
Specifications
| Spec | Value |
|---|---|
| Sound output | 149 dB (test distance not disclosed) |
| Trumpet count | 4 |
| Trumpet lengths | 13-3/4”, 11-1/2”, 9-1/4”, 7-3/4” |
| Front bell diameter | 3-3/4” each |
| Horn assembly (L x W x H) | 14” x 6-3/4” x 6-1/2” |
| Air tank | 1.5 gallon |
| Compressor | 12V, 150 PSI, thermal-overload protected |
| Compressor size (L x W x H) | 9-1/2” x 4” x 6-3/4” |
| Pressure switch | 120/150 PSI |
| Air gauge | 240 PSI |
| Material | Black-coated metal trumpets |
| Power source | Air tank (12V compressor) |
| Warranty | Not formally disclosed |
A note on the dB figure: Viking publishes “149 dB” with no reference distance. Most aftermarket horns are measured very close to the bell (often around 2 in to 1 ft), which inflates the number versus the 100 ft measurement used for real locomotive ratings. Treat 149 dB as a marketing-grade peak claim, not a verified field measurement. Our decibels explained guide covers why test distance changes everything.
What’s in the box
- Four-trumpet black metal air horn assembly
- 1.5-gallon air tank
- 12V 150 PSI heavy-duty compressor with thermal overload protection
- Electric air valve (solenoid)
- 120/150 PSI air pressure switch
- 240 PSI air gauge
- Brass fittings and air hose
- Mounting hardware
- Installation instructions and a horn button
This is genuinely everything needed to wire and plumb a working system — a real advantage over buying a bare horn and sourcing the air components separately.
Pros
- Complete kit. Trumpets, tank, compressor, valve, gauge and switch all ship together — no parts hunting.
- Four-trumpet chord. The graduated 13-3/4” to 7-3/4” trumpets stack into a fuller, more locomotive-like tone than two- or three-trumpet kits.
- Aggressive price. It undercuts most name-brand four-trumpet systems by a wide margin.
- Reasonable hardware. A thermal-overload compressor and brass fittings are sensible inclusions at this price.
- Universal fit. No vehicle-specific brackets — it adapts to trucks, RVs, SUVs and boats.
Cons
- Unqualified dB claim. “149 dB” with no stated distance can’t be compared honestly against rated products.
- Thin spec sheet. No published chord frequencies, no weight, and no formal warranty terms.
- Small tank. 1.5 gallons gives only a handful of full-length blasts before the compressor has to catch up.
- Economy build. The black-coated finish and budget fittings aren’t built for long-term corrosion resistance.
Alternatives
- Viking Horns V103C-5/310 — Viking’s bigger four-trumpet kit with a 3-gallon tank and a louder low-pitch claim; step up here if you want more air capacity from the same brand.
- Viking Horns V101C-3/307B — the three-trumpet sibling on the same compressor and tank platform; slightly cheaper if four trumpets aren’t essential.
- Vevor 4-Trumpet — a direct budget rival with comparable specs and a similarly loud chord; worth comparing on current price and seller support.
If you’re shopping purely on price, our best train horn under $200 guide puts these budget four-trumpet kits in context.
Install / compatibility notes
This is a 12V air-tank system, so installation has both an electrical and a plumbing side. The compressor draws meaningful current and should be wired through a relay on a fused circuit rather than directly off the horn button — see our train horn relay wiring guide for the standard diagram. The pressure switch automatically cycles the compressor to keep the tank between 120 and 150 PSI.
On the air side, you’ll mount the 1.5-gallon tank somewhere dry and secure (bed rail, frame rail, or trunk), run air line to the trumpets, and seal every brass fitting with thread tape to avoid slow leaks — a common first-install headache covered in our air leak diagnosis guide. Because the four-trumpet assembly takes up real space, dry-fit your mounting location before drilling; under-bed or behind-grille placement is typical on trucks.
For general placement strategy, our where to mount a train horn guide walks through angle and drainage. And before you wire anything, check your state’s rules — aftermarket horns sit in a legal gray area in several states, which we track in our legal coverage.
A practical reliability note, framed as aggregated owner reports rather than our own testing: across retailer reviews for budget Viking and Vevor-class kits, the two recurring failure points are the same — the compressor and the solenoid valve. The compressor on a 1.5-gallon system runs more often than on a larger tank because it refills sooner, so wiring it through a proper relay and keeping the tank drained of moisture both extend its life. The electric valve is the other wear item; because it’s a cheap commodity part, owners who keep a spare report far less downtime than those who have to source one in a hurry. Our air horn lifespan guide covers the maintenance habits that matter most.
Climate matters too. Any compressed-air horn pulls humidity into the tank, and in cold regions that moisture can freeze in the lines and choke the horn — our winter prep guide explains how to drain and protect the system. None of this is unique to the V101C; it’s the cost of entry for any budget air-tank kit, and going in aware of it is the difference between a horn that lasts years and one that quits in a season.
Sources
- Viking Horns — 149dB Black 4-Trumpet Air Horn Kit (V101C-3/4008B) — official spec sheet: 149 dB, trumpet lengths, horn and compressor dimensions, thermal-overload compressor, pressure switch and gauge ratings, kit contents
- Amazon — Viking Horns 149dB Train Air Horn Kit (V101C-3/4008B) — dB claim, 1.5-gallon tank, 150 PSI compressor
- Amazon — Viking Horns Four Trumpet Train Air Horn Kit (V101C-3/003A) — four-trumpet configuration and included components
- Walmart — Viking Horns V101C-3/4008B 149 dB Black 4-Trumpet Kit — pressure switch and gauge ratings, kit contents
- eBay — Viking Horns V101C-3/4008B Loud 149 Decibels 150 PSI Black Air Horn Kit — cross-check on model number, dB, PSI and tank size
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
A loud, cheap, complete four-trumpet kit that suits budget builders who want maximum trumpets per dollar — but the missing test distance and thin spec disclosure keep it well short of premium kits.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Viking Horns V101C really?
- Viking advertises 149 dB, but that figure is published with no stated test distance — almost certainly a close-range bell measurement rather than the 100 ft standard used for locomotives. It is genuinely loud for a budget kit, but treat 149 dB as a peak marketing claim, not a verified field number.
- Is the V101C a complete kit or just the horns?
- It's a complete system. The box includes the four-trumpet horn, a 1.5-gallon air tank, a 150 PSI 12V compressor, the electric air valve, a pressure switch, an air gauge, brass fittings, air hose, mounting hardware and a horn button.
- What size air tank and compressor does it use?
- A 1.5-gallon tank paired with a 12V 150 PSI compressor that has thermal-overload protection. The pressure switch keeps the tank between roughly 120 and 150 PSI. The small tank means a few full blasts before the compressor needs to recover.
- Does the V101C still have a manufacturer warranty?
- Viking does not publish formal warranty terms for the V101C, so there's no stated coverage period to rely on. In practice, any warranty support typically comes through the retailer you buy from.
- How does it compare to the Vevor 4-trumpet kit?
- They're close rivals: both are budget four-trumpet kits with similar dB claims, small tanks and complete air systems. Decide on current price and seller support rather than spec sheets, since neither brand discloses chord frequencies or formal warranties.
