Kleinn Model 502 Kraken Steel Triple Train Horn Review (2026)

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: September 10, 2026. Primary source: Kleinn’s official Model 502 “Kraken” product page, cross-checked against Kleinn’s Model 501, Model 500 and Model 730 pages, Kleinn’s train horn collection and warranty pages, Kleinn’s 6350 and 6450 onboard air system pages, and third-party retailer listings at Pure Diesel Power and Billy Bobs Offroad.

Quick verdict

The Kleinn Model 502 “Kraken” is the top rung of Kleinn’s 500 Series triples, and it earns a 4.2/5 from us. It takes the same 16”/14”/11” chrome-plated steel trumpets as the mid-tier 501 “Warlock” and feeds them through a heavy-duty brass Vortex 6 VX6003 solenoid and 1/2” airline, which is how Kleinn gets its published 155.2 dB at 150 PSI rating, up from 151.8 dB on the 501. At $319.95 direct it costs $30 more than the 501, and in our opinion the high-flow valve alone justifies that gap for anyone chasing output. The two things to price in before you buy: this is a horn-only assembly that needs a 140-160 PSI onboard air system with at least a 2.5-gallon tank, and Kleinn does not disclose the microphone distance behind the dB figure.

What it is

The Model 502 Kraken is a horn-only triple train horn assembly: three individually tuned trumpets in 16”, 14”, and 11” lengths, formed from steel and chrome-plated, mounted on a heavy-duty triangular aluminum right-angle bracket. Kleinn lists 6-7” bells for its train horn series and positions the Kraken as the “top tier” of the 500 Series, above the chrome-ABS Model 500 “Sentinel” and the chrome-steel Model 501 “Warlock”. What separates the 502 from the 501 is not the trumpets but the plumbing: a Vortex 6 VX6003 heavy-duty brass 12V solenoid with 12 feet of 1/2” outer-diameter airline replaces the Model 307 Vortex 4 solenoid and 1/4” line on the two lower models.

Per Kleinn’s page, the trumpets are reversible on the bracket, so you can aim bells forward and rearward for the multi-directional effect of a passing locomotive, and the low-profile bracket is designed for both under-body and rooftop installs. The buyer this suits is someone who already runs, or is about to buy, a 150-200 PSI onboard air system and wants the loudest chrome triple Kleinn sells short of the stainless Demon 730. If you want a complete kit with compressor and tank in one box, see the Kleinn hub for the HK-series kits instead.

Specifications

Spec	Value
Model	Kleinn Model 502 “Kraken” (SKU KL 502)
Format	Horn-only triple train horn assembly, individual-mount trumpets
Sound output	155.2 dB at 150 PSI (test distance not disclosed)
Operating pressure	140-160 PSI; Kleinn cites 140-200 PSI cut-off as optimal for its air systems
Minimum tank	2.5 gallons
Trumpets	3, chrome-plated steel, 16” / 14” / 11” long, 6-7” bells
Solenoid	Vortex 6 VX6003 heavy-duty brass, 12V DC
Airline	12 ft of 1/2” OD, included
Mounting	Triangular aluminum right-angle bracket, reversible trumpets
Overall dimensions	15.5” L x 11.5” W x 11.5” H
Weight	Not published on the product page (Kleinn’s store data lists about 18 lb, likely a shipping weight)
Chord frequencies	Not disclosed
Power source	Air tank (12V trigger for the solenoid)
Warranty	1-year limited
Price	$319.95 direct from Kleinn; $319.95 at Pure Diesel Power

Rated output

155.2 dB at 150 PSI

Pressure window

140-160 PSI

Valve

VX6003 brass, 1/2” line

Price

$319.95

A note on the numbers: Kleinn’s 6350 (150 PSI, 3-gallon) and 6450 (200 PSI, 5-gallon) systems are the pairings Kleinn names on the 502 page, and both exceed the 2.5-gallon minimum. The 155.2 dB figure is a manufacturer claim at a stated pressure with no stated distance, which is the same disclosure level Kleinn uses across the 500 Series. Our guide to advertised vs. real dB explains why distance matters as much as pressure.

What’s in the box

Kleinn’s “What’s in the box” list for the 502:

• Kraken triple trumpet assembly: chrome-plated steel trumpets in 16”, 14”, and 11” lengths
• Triangular aluminum right-angle mounting base
• Hardware kit with bolts and fasteners for the horn and bracket
• One Vortex 6 VX6003 heavy-duty 12V brass solenoid valve
• 12 ft of 1/2” outer-diameter airline

Not included: compressor, air tank, pressure switch, relay, wiring, or a horn button. Kleinn sells those as separate onboard air systems and accessory kits.

Pros

• Highest published output in the 500 Series: 155.2 dB at 150 PSI, with the test pressure disclosed
• Chrome-plated steel trumpets, which Kleinn positions as denser and more resonant than the ABS bells on the Model 500
• Brass Vortex 6 VX6003 solenoid and 12 ft of 1/2” airline included, so the high-flow air path is complete out of the box
• Only $30 more than the 501 Warlock for the valve and line upgrade that adds 3.4 dB on paper
• Reversible trumpets and a low-profile right-angle bracket suit frame, bed, and roof mounts
• Kleinn publishes an audio sample for the 502 alongside the 500 and 501, so you can compare the three before buying

Cons

• No test distance disclosed for the 155.2 dB rating, so it cannot be compared to SAE-style measurements
• Horn only: a compatible 150-200 PSI air system from Kleinn adds $529.95 to $579.95
• 1-year limited warranty, while Kleinn gives its 730 horns two years and HornBlasters covers Shocker horns for life
• Older retailer listings still describe a copper-trumpet 502 with different dB, trumpet lengths, and valve, which makes cross-shopping confusing
• No chord frequencies or verified product weight published
• Needs 140 PSI minimum; a 120-130 PSI light-duty compressor will not reach the rated output

Alternatives

• Kleinn Model 500 “Sentinel” ($239.95): same trumpet lengths and bracket in chrome-plated ABS with a 1/4” Vortex 4 solenoid, rated 151.8 dB at 150 PSI. The value pick if you can live with plastic bells. See our Kleinn Model 500 review.
• Kleinn Model 501 “Warlock” ($289.95): the same chrome-plated steel trumpets as the Kraken with the 307 Vortex 4 solenoid and 1/4” line, rated 151.8 dB at 150 PSI. Worth it only if you plan to upgrade the valve yourself later.
• Kleinn Demon Model 730 (from $499.95): stainless-steel triple rated 157.8 dB at 150 PSI on a flat rack, with the same VX6003 valve and a 2-year warranty. The step up if budget and mounting space allow. See our Kleinn Demon 730 review.
• HornBlasters Shocker XL: the obvious cross-brand comparison, a four-bell horn sold as a complete kit with lifetime horn warranty. See our Shocker XL review and the Kleinn vs HornBlasters guide.

Install / compatibility notes

Air. Kleinn specifies a 2.5-gallon minimum tank and a 140-160 PSI operating window, with 140-200 PSI cut-off pressure called optimal on the 502 page. In practice that means a 150 PSI or 200 PSI system: Kleinn’s own Model 6350 is a 150 PSI, 100%-duty compressor on a 3-gallon tank for $529.95, and the Model 6450 is a 200 PSI compressor on a 5-gallon tank for $579.95. Any quality compressor and tank combination that holds 150 PSI will work; our air tank size guide and PSI explainer cover how much reserve you actually need for a three-trumpet horn drawing through a 1/2” valve.

Plumbing. The 1/2” OD airline is the whole point of the 502, so do not neck it down. Your tank port or manifold needs a 1/2” push-to-connect or compression fitting to match, and the run from tank to solenoid should be as short as practical; the solenoid mounts at the horn’s air block. If you are adding the Kraken to a system built for 1/4” line, plan on new fittings. Our air fittings guide lists the common sizes.

Electrical. The VX6003 is a 12V solenoid, wired like any other: a fused feed from the battery through a relay, triggered by a horn button or the factory horn circuit. Kleinn does not include the relay, wire, or switch with the 502. See wiring a train horn relay for a diagram and fuse sizing.

Mounting. At 15.5” x 11.5” x 11.5” the assembly needs real estate: full-size truck frame rails, a bed-mount, or a roof or headache-rack install are the natural homes. The right-angle bracket bolts to a flat surface, and the reversible trumpets let you split bells forward and rearward on a roof mount. Chrome-plated steel is heavier than the ABS Model 500, so use the supplied hardware in solid steel rather than sheet-metal panels. Our guide to where to mount a train horn covers under-body drainage, which matters for steel trumpets that can hold water.

Which generation you are buying. Kleinn’s current page describes chrome-plated steel trumpets, 155.2 dB at 150 PSI, and the VX6003 valve. Retailer listings at Pure Diesel Power and Billy Bobs Offroad still describe an earlier 502 with chrome-plated spun copper trumpets, 152.2 dB at 150 PSI (or “up to 154.2 dB”), a 175 PSI maximum input, shorter 13.5”/11.75”/8.5” trumpets, and a VX4003 or Vortex 6 valve depending on the listing. If you buy from a third party, confirm which version ships before ordering.

Sources

• Kleinn — Model 502 “Kraken” Chrome-Plated Steel Triple Train Horns product page — all core specs: 155.2 dB at 150 PSI, 140-160 PSI operating range, 2.5-gallon minimum tank, 16”/14”/11” chrome-plated steel trumpets, 6-7” bells, VX6003 brass solenoid, 12 ft of 1/2” airline, 15.5” x 11.5” x 11.5” dimensions, 1-year warranty, $319.95 price, included items, 6350/6450 compatibility, reversible trumpets and bracket, 500 Series positioning, store shipping weight
• Kleinn — Model 501 “Warlock” Chrome-Plated Steel Triple Train Horns product page — 501 specs used for comparison: 151.8 dB at 150 PSI, Model 307 Vortex 4 solenoid, 1/4” airline, $289.95, and the 500/501/502 hierarchy description
• Kleinn — Model 500 “Sentinel” Chrome-Plated ABS Triple Train Horns product page — Model 500 specs used in the alternatives section: chrome ABS trumpets, 151.8 dB at 150 PSI, $239.95
• Kleinn — Train horns collection — current direct pricing across the 500 Series and Demon 730 (from $499.95)
• Kleinn — Horn audio samples page — brand-published sound clips for the Model 500, 501, and 502
• Kleinn — Warranty information — 1-year limited warranty terms, exclusions, and claim process
• Kleinn — Model 730 “Demon” Stainless Steel Triple Train Horns product page — 730 specs used in the alternatives and warranty comparison: 157.8 dB at 150 PSI, stainless trumpets on a flat rack, VX6003 solenoid, 2-year warranty
• Kleinn — Model 6350 Heavy Duty 150 PSI Onboard Air System — 150 PSI compressor, 3-gallon tank, 100% duty at 100 PSI, $529.95
• Kleinn — Model 6450 Ultra Heavy Duty Onboard Air System — 200 PSI maximum compressor, 5-gallon tank, $579.95
• Pure Diesel Power — Kleinn Model 502 Train Horns listing — $319.95 retail cross-check and earlier-generation specs (chrome-plated spun copper trumpets, 152.2 dB at 150 PSI, 149.1 dB at 100 PSI, 175 PSI max input, VX4003 valve)
• Billy Bobs Offroad — Kleinn 502 Chrome Triple Train Horn listing — earlier-generation specs (copper trumpets, up to 154.2 dB, 13.5”/11.75”/8.5” trumpets, 16.75” x 12” x 11”, 12-month warranty)
• HornBlasters — Warranty Information — lifetime coverage on Shocker horns used in the warranty comparison

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