Kleinn HK3 ProBlaster Triple Air Horn Kit 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: July 24, 2026. The numbers below come from Kleinn’s official HK3 product page, Kleinn’s component listings for the 6270RC compressor and the 2130-series pressure switch, and retailer listings from Dale’s Super Store, Summit Racing, and AmericanTrucks for price, weight, and fitment cross-checks. Every source we used is listed at the end of this article.

Quick verdict

The Kleinn HK3 ProBlaster is the triple-trumpet middle child of Kleinn’s compact ProBlaster family — three tuned all-metal trumpets on a single bracket, fed by a 130 PSI sealed compressor and a 1.0-gallon steel tank. At $439.95 it is priced like a serious kit, and the hardware mostly earns it: chrome-plated steel horns, a waterproof oil-less compressor, and a five-port tank that leaves room to grow. We rate it 4.0/5. It loses points for the dB rating Kleinn doesn’t publish at the kit level, for a small tank that keeps honks short, and for duty-cycle figures that don’t quite agree across Kleinn’s own pages. For a driver who wants genuine train-horn attitude in a footprint that hides behind a grille, it’s one of the cleaner-engineered options in this class.

What it is

The HK3 is a complete, universal 12-volt air horn kit built around Kleinn’s Model 130 horn assembly: three tuned metal trumpets measuring 14.25”, 11.5”, and 9.25”, chrome-plated and mounted on a single compact bracket. Kleinn markets it as a “startling blended 3-tone blast” — a chord, not a single note, which is what separates train-style horns from ordinary electric beepers (our guide on why train horns make a chord explains the acoustics).

Unlike a bare horn, the HK3 ships as a full onboard-air system: compressor, tank, pressure switch, solenoid valve, wiring, and fittings in one box. It targets pickup and SUV owners who want maximum sound from a compact package — the horn assembly measures roughly 14” long by 6” wide by 6.5” tall, small enough to tuck behind a grille or inside an engine bay where full-size quad kits won’t fit. It sits between the dual-trumpet Kleinn HK2 and the quad-trumpet Kleinn HK4 in the ProBlaster range; our Kleinn brand hub covers the whole lineup.

Two finishes are offered: the chrome HK3 reviewed here, and the HK3-1, which wears Kleinn’s XCR2.0 black coating for a stealth look. Specs are otherwise identical.

Specifications

Spec	Value
Horn assembly	Model 130 triple chrome-plated steel, single-mount
Trumpet lengths	14.25” / 11.5” / 9.25”
Sound output	No kit-level dB rating published. Kleinn’s air horn spec chart lists the Model 130 horn assembly at 149.6 dB at 150 PSI (test distance not disclosed)
System operating pressure	100–130 PSI (pressure switch: 100 PSI cut-in / 130 PSI cut-out)
Compressor	Kleinn 6270RC, 12V DC, sealed, waterproof, oil-less
Compressor duty cycle	25% @ 100 PSI (@ 72°F) per the HK3 kit page; Kleinn’s standalone 6270RC listing labels it 15%
Max amp draw	14 A
Air tank	Kleinn 6270RT, 1.0-gallon coated steel, five 1/4” NPT ports, ~11” × 6” × 8”
Valve	12V electric solenoid valve (Kleinn Model 307)
Horn assembly dimensions	~14” L × 6” W × 6.5” H
Kit weight	17.0 lb
Voltage	12V DC
Finishes	Chrome (HK3) or XCR2.0 black (HK3-1)
Warranty	1-year limited (defects in materials and workmanship)
Price	$439.95 (Kleinn direct and major retailers)

A note on that dB line: Kleinn does not advertise a decibel number for the HK3 kit itself, which is arguably more honest than the inflated “150 dB+” claims common in this market. The 149.6 dB chart figure applies to the bare Model 130 horn assembly fed 150 PSI — more pressure than this kit’s 130 PSI system ever delivers — so real-world output will land below it. Our guide on advertised vs real-world decibels explains why the distinction matters.

What’s in the box

• Model 130 triple chrome-plated steel horn assembly (single bracket)
• Kleinn 6270RC 130 PSI waterproof sealed air compressor
• Kleinn 6270RT 1.0-gallon coated steel air tank with five 1/4” NPT ports and drain valve
• Tank-mount pressure switch (100 PSI on / 130 PSI off)
• 12V electric solenoid valve
• Snorkel kit — remote-mount intake filter assembly for the compressor
• FIT34 fitting pack, thread sealant, 1/4” air line and 3/8” snorkel hose
• Complete wiring harness with relays, horn button, and high-tensile fasteners

That is a genuinely complete install — no separate fitting or wiring purchases needed for a standard setup, which is not a given at this price tier.

Pros

• All-metal tuned trumpets — chrome-plated steel, not the ABS plastic used by many budget triples
• True one-box kit: compressor, tank, pressure switch, solenoid, wiring harness, relays, and fittings all included
• Waterproof, sealed, oil-less compressor with thermal overload protection and a remote intake snorkel
• Compact single-bracket horn assembly (~14” long) fits behind grilles where full-size kits won’t
• Five-port tank makes later expansion (second horn, air accessories) easy
• Stealth black HK3-1 variant available at the same spec

Cons

• No kit-level dB rating published — buyers must infer loudness from the horn-assembly chart figure
• Kleinn’s own pages disagree on compressor duty cycle (25% on the kit page vs 15% on the standalone 6270RC listing)
• 1.0-gallon tank supports only short blasts before the compressor needs to rebuild pressure
• 1-year warranty trails the multi-year coverage some competitors offer
• $439.95 is a real premium over visually similar imported triple kits

Alternatives

• Kleinn HK2 — the compact dual-trumpet ProBlaster; smaller, cheaper, same 130 PSI air system architecture, two-tone instead of three-tone blast.
• Kleinn HK4 — the quad-trumpet step-up for buyers who want a fuller four-note chord and don’t mind a larger footprint.
• HornBlasters Outlaw 232 — the closest cross-brand rival: a compact two-horn kit from Kleinn’s biggest competitor; see our Kleinn vs HornBlasters comparison for the brand-level tradeoffs.

Install / compatibility notes

The HK3 is sold as a universal 12-volt kit — Kleinn and its retailers list it against everything from Ram 1500s to Tacomas and Wranglers with the note “some adaptation may be required.” Practical points from the published documentation:

• Electrical: the compressor pulls up to 14 A, so it wires through the included relay to a fused battery feed. Our amp draw and wire gauge guide and relay wiring guide cover the details.
• Mounting: the horn assembly is a single bracket, so placement is a one-bolt-pattern job. Horns should face down or level so water drains — see where to mount a train horn.
• Compressor placement: the sealed, waterproof design tolerates under-body mounting, and the included snorkel kit lets you relocate the air intake to a dry spot — a genuinely useful touch for trucks that see rain or off-road use.
• Air system: the pressure switch automates everything (compressor kicks in at 100 PSI, off at 130 PSI). Drain the tank periodically to purge moisture — our tank drain guide explains the routine, and the duty-cycle limits are covered in our duty cycle explainer.

Expect a half-day DIY install for a typical pickup; there is no vehicle-specific bracketry in the box, so plan your mounting points before ordering.

One sizing consideration worth flagging: the 1.0-gallon tank is the smallest capacity Kleinn ships in a ProBlaster kit, and it is matched to short attention-getting blasts rather than long locomotive-style pulls. If you expect to lay into the horn for several seconds at a time, budget for a larger reservoir up front — our air tank size guide and second tank guide walk through the math, and the HK3’s five-port tank makes plumbing an extra reservoir straightforward later.

Sources

• Kleinn — Model HK3 Universal ProBlaster Complete Triple Air Horn Kit (Chrome) — price, trumpet specs, Model 130 horn chart figure (149.6 dB @ 150 PSI), compressor duty cycle and amp draw, tank, included items, warranty
• Kleinn — Model HK3-1 Universal ProBlaster Complete Triple Air Horn Kit (Black) — XCR2.0 black variant
• Kleinn — Model 6270RC sealed air compressor — standalone compressor listing (15% duty cycle label, 130 PSI)
• Dale’s Super Store — Kleinn HK3 kit listing — $439.95 price, 17.0 lb kit weight, trumpet lengths, five-port tank
• Dale’s Super Store — Kleinn 2130 pressure switch — 100 PSI on / 130 PSI off switch specification
• Summit Racing — Kleinn HK3-1 listing — retailer availability cross-check
• AmericanTrucks — Kleinn HK3 (Ram 1500 fitment) listing — universal fitment wording, kit description cross-check

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