- +Full 1/2" solenoid and air line where budget kits ship 1/4"
- +5-gallon tank supports long, repeated blasts
- +200 PSI compressor rated for 100% duty cycle
- +Stainless trumpet weather covers included
- +Complete kit: gauge, pressure switch, button, fittings
- +1-year warranty plus 30-day satisfaction guarantee
- −170 dB claim lacks a test distance and is ~20 dB beyond measured locomotive horns
- −Official listing contradicts itself on tank size and compressor rating
- −No chord frequencies or measured output disclosed
- −Brand's official domain currently redirects elsewhere; support uncertain
- −27% of Amazon ratings are 1-2 stars
Methodology
This review aggregates publicly available information from manufacturer specifications, retailer listings, and verified user reviews. We do not perform hands-on testing. Sources for this article include Viking Horns’ official product listing (accessed via the Internet Archive, as the brand’s storefront is currently offline — more on that below), the brand’s published warranty policy, the Amazon listing for the black-trumpet V103C-6-12/311-1B, and third-party decibel commentary from HornBlasters’ measurement guide. Last reviewed: July 17, 2026.
Quick verdict
The Viking Horns V103C-6-12/311-1B is a study in contrasts: the air hardware underneath is genuinely better than most budget kits — a 5-gallon tank, a 200 PSI compressor rated for 100% duty cycle, and real 1/2-inch plumbing end to end — but it’s all sold under the single most inflated decibel claim we track. Viking advertises 170 dB with no test distance, a number roughly 20 dB beyond what independent testing has measured from actual cast-metal locomotive horns. We rate it 3.3/5: buy it for the air system and the parts list, not the number on the box, and expect real-world output in the same 135–146 dB neighborhood as other large metal-trumpet aftermarket kits.
What it is
The V103C-6-12/311-1B is Viking Horns’ flagship-loudness 3-trumpet train horn kit in black. You get three metal trumpets on a common manifold (the same 311 trumpet trio also sold in chrome as the V103C-6-12/311-1), fed by a 5-gallon (18-liter) air tank and a 12-volt, 200 PSI compressor that Viking rates for 100% duty cycle. A 1/2-inch electric solenoid valve and 1/2-inch air hose handle delivery — a meaningful step up from the 1/4-inch lines bundled with cheaper kits, since valve and line diameter are a real bottleneck for horn output (see our guide to air line sizing).
It’s a universal-fit system aimed at full-size trucks, SUVs, and RVs with room for a 5-gallon tank. Per the official listing, the kit also includes three stainless steel weather-protection covers for the trumpet mouths — a genuinely uncommon inclusion at this price.
One housekeeping note that affects this whole review: Viking Horns’ own web store (viking-horns.com) currently redirects to an unrelated website, so every “official” spec below is drawn from the Internet Archive’s July 2024 snapshot of the product page and cross-checked against live retailer listings. That’s also why we flag after-sale support as a question mark.
Specifications
| Spec | Value |
|---|---|
| Advertised sound level | 170 dB (test distance not disclosed) |
| Realistic output | ~135–146 dB, editorial estimate for this class of kit (see below) |
| Trumpets | 3, metal, black finish (chrome sibling: V103C-6-12/311-1) |
| Horn assembly dimensions | 19 1/4” L × 18” W × 7 1/2” H |
| Compressor | 12V, 200 PSI, 100% duty cycle; 10 3/4” L × 4” W × 6 3/4” H |
| Air tank | 5 gallon (18 L) |
| Air valve | 1/2” electric solenoid |
| Air line | 1/2” hose |
| Gauge | 240 PSI air gauge |
| Pressure switch | ”170/150 PSI” as printed on the official listing |
| Chord frequencies | Not disclosed |
| Warranty | 1 year limited (original purchaser) + 30-day satisfaction guarantee |
| Price | $454.46 on the archived official store |
| Amazon owner rating | 3.8/5 from 44 ratings |
A caution on Viking’s spec sheet: the official product description contradicts itself. The body text describes “a 3-gallon air tank and 12 volts 150 PSI heavy-duty maintenance-free compressor” — clearly copy-pasted from a smaller Viking kit — while the same page’s “Product Includes” block lists a 5-gallon 250 PSI-rated tank, and the Amazon listing confirms the 5-gallon tank and 200 PSI compressor. The tank dimensions printed on the official page (21” L × 6 1/2” diameter) work out to roughly 3 gallons, so they belong to the older copy too. We’ve listed the specs both retail listings agree on, but this level of sloppiness in a manufacturer’s own listing is worth knowing before you buy.
What’s in the box
- 3 black metal trumpets on mounting manifold
- 5-gallon (18 L) air tank
- 12V 200 PSI, 100%-duty-cycle air compressor
- 1/2” electric air valve solenoid
- 1/2” air hose
- 240 PSI air gauge and pressure switch
- Horn button, mounting hardware, and brass fittings
- 3 stainless steel weather-protection trumpet covers
- Installation instructions
Pros
- Full 1/2” plumbing — solenoid and air line — where budget kits typically ship 1/4”
- 5-gallon tank supports long, repeated blasts and onboard-air side uses
- Compressor rated 200 PSI at 100% duty cycle, per the Amazon listing
- Stainless trumpet weather covers included — rare at any price
- Complete kit: gauge, pressure switch, solenoid, button, and fittings all in the box
- 1-year warranty plus 30-day satisfaction guarantee published by the brand
Cons
- The 170 dB claim has no disclosed test distance and exceeds independently measured locomotive-horn output by ~20 dB — the least credible rating in the segment
- Official listing text contradicts itself on tank size and compressor rating
- No chord frequencies and no measured-output data disclosed
- Viking’s official domain currently redirects elsewhere, making warranty and parts support uncertain
- Mixed owner feedback: 27% of Amazon ratings are 1–2 stars
The 170 dB claim vs. reality
This kit is a textbook case for our guide on advertised vs real-world decibels. HornBlasters’ decibel guide, citing an independent DJD Labs comparison test, notes that genuine cast-metal locomotive horns — the Nathan AirChime K5LA — top out at 149.4 dB measured, and flatly calls claims above 150 dB misinformation, comparing 150 dB to a rifle shot at close range. A three-trumpet aftermarket kit does not out-shout a five-chime locomotive horn by 20 dB. Viking publishes the same 311 trumpet set in other kits with a “152 dB” rating, which further suggests the 170 figure describes marketing ambition rather than acoustics. To be clear, user demo videos show this class of Viking kit is genuinely loud — comfortably in authentic train-horn territory — just not 170 dB loud. Our editorial estimate, consistent with independent commentary on large metal-trumpet kits, is real-world output in the 135–146 dB range at close distance.
Alternatives
- HornBlasters Conductor’s Special 228H — the benchmark 4-trumpet Shocker kit with disclosed measurement methodology and a bigger support ecosystem; costs more. Read our Conductor’s Special 228H review.
- Viking Horns V103C-5/310 — Viking’s 4-trumpet, “162 dB”-rated sibling with a 3-gallon tank; cheaper way into the same brand. See our V103C-5/310 review.
- Vixen Horns VXH3318B — another budget black 3-trumpet kit with similar honest-loudness expectations. See our VXH3318B review.
More Viking coverage lives on our Viking Horns brand hub, including the entry-level V101C-3/307B.
Install / compatibility notes
This is a full onboard-air install, not a bolt-on: you’ll mount the 21-inch-class tank (frame rail or bed), the compressor in a splash-protected location, the trumpet assembly (19 1/4” × 18” footprint — measure first; see mounting spots), then plumb the 1/2” line and wire the compressor and solenoid through a relay with an inline fuse. Viking includes the pressure switch and gauge; plan on 10–8 AWG compressor wiring and a relay harness (our relay wiring guide covers the diagram). The pressure switch’s printed spec differs between listings — the official page prints “170/150 PSI” while the Amazon listing prints 170/200 PSI — so confirm the actual cut-in and cut-out pressures on the part itself, and verify your tank’s rating plate before setting anything above stock. A 100%-duty compressor filling 5 gallons still takes several minutes from empty — see our duty cycle explainer and tank size guide for what to expect.
Sources
- Viking Horns — V103C-6-12/311-1 official product page (Internet Archive snapshot, July 2024) — 170 dB claim, $454.46 price, included items, horn/compressor/tank printed dimensions, weather covers, contradictory 3-gallon/150 PSI description text
- Viking Horns — Warranty Policy (Internet Archive snapshot, July 2024) — 1-year limited warranty and 30-day satisfaction guarantee terms
- Amazon — Viking Horns V103C-6-12/311-1B listing — black variant specs (200 PSI compressor, 5-gallon tank, 1/2” solenoid and hose), 3.8/5 rating and histogram from 44 ratings, verified via the Internet Archive’s December 2024 snapshot
- Amazon — Viking Horns V103C2X-6-12/311-1B dual-compressor kit — existence and specs of the dual-compressor variant
- HornBlasters — How Loud Are Your Train Horns? — DJD Labs test context, 149.4 dB measured ceiling for the Nathan K5LA, industry commentary on 150+ dB claims
- YouTube — Viking 3 Trumpet Train Air Horn kit (Derick Ponce-Sanchez) — owner demo of a Viking 3-trumpet kit’s sound character
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
A genuinely well-equipped 5-gallon, 200 PSI, half-inch-plumbed kit undermined by the least credible decibel claim in the segment and a brand whose own website has gone dark. Buy it for the hardware at the right price and expect real-world output around 135-146 dB, not 170.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Viking Horns V103C-6-12/311-1B really?
- Viking advertises 170 dB with no test distance disclosed. Independent testing cited by HornBlasters measured real cast-metal locomotive horns topping out at 149.4 dB, so the claim is not physically credible. Expect genuinely loud real-world output in roughly the 135-146 dB class typical of large metal-trumpet aftermarket kits.
- What size tank and compressor does this kit include?
- The kit ships with a 5-gallon (18-liter) air tank and a 12-volt, 200 PSI compressor rated for 100% duty cycle, per the Amazon listing; the official listing's includes block also lists the 5-gallon tank. Note the official description text also mentions a 3-gallon tank and 150 PSI compressor - leftover copy from a smaller Viking kit.
- Is the Viking Horns V103C-6-12/311-1B hard to install?
- It is a full onboard-air installation: tank, compressor, trumpet assembly, 1/2-inch air line, solenoid, and relay wiring. The 19 1/4 by 18 inch horn footprint and 21-inch-class tank need real space, so it suits full-size trucks, SUVs, and RVs.
- What warranty does Viking Horns offer?
- Viking's published policy is a 1-year limited warranty to the original purchaser plus a 30-day satisfaction replacement-or-refund guarantee. However, the brand's official website currently redirects to an unrelated domain, so warranty service logistics are an open question - factor that into the purchase decision.
- What is the difference between the V103C-6-12/311-1 and 311-1B?
- The trailing B denotes black-finished trumpets; the V103C-6-12/311-1 is the same 3-trumpet kit with chrome trumpets. Viking also sells a dual-compressor version (V103C2X-6-12/311-1B) that fills the 5-gallon tank faster.
