- +154.2 dB at 150 PSI claimed output from a compact dual-trumpet setup
- +Vehicle-specific frame-rail bracket — 100% bolt-on, no drilling or cutting via the factory horn button
- +Fires from the factory horn button for a stealthy, clutter-free install
- +40-page official installation manual with fitment chart and maintenance schedule
- +Works with any onboard-air system meeting 100 PSI / 1-gallon minimums
- −Horn-only kit — separate compressor and tank add substantially to real system cost
- −Decibel rating published without a test distance
- −Fits four-door 3.6L gas JLU/JT only; 2-doors and diesel/hybrid excluded
- −No chord frequency or trumpet dimension specs disclosed
- −One-year warranty, versus two years on Kleinn's 730 horns and 6450/6650 compressors
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 26, 2026. Our sources for this article are Kleinn’s official product page, Kleinn’s 40-page JL-220 installation and operation manual, and retailer listings from Quadratec, ExtremeTerrain, and Offroad Alliance. Every number below traces back to a URL in the Sources section at the end.
Quick verdict
The Kleinn JL220 is the most integrated way to put a real train horn on a four-door Jeep Wrangler JL: a vehicle-specific bracket that bolts to the passenger-side frame rail, dual Model 220 trumpets rated by Kleinn at 154.2 dB at 150 PSI, and wiring that fires from the factory horn button with no drilling or cutting. What it is not is a complete kit — there is no compressor or tank in the box, so you need to budget for an onboard-air system before the horns ever make a sound. We rate it 4.1/5: the fitment engineering and documentation are among the best in the Kleinn lineup, while the horn-only format and a decibel rating published without a test distance keep it from scoring higher.
What it is
The JL220 (Kleinn SKU “KL JL220,” listed by Quadratec under part number 92043-1115) is an add-on train horn kit built specifically for the 2018-and-newer Jeep Wrangler JL Unlimited four-door with the 3.6L gas engine. Instead of a universal horn you have to find room for, Kleinn ships a custom direct-fit bracket that positions two black Model 220 trumpets along the passenger-side frame rail, next to the transmission — out of sight and largely out of the weather. Per Kleinn, the kit is 100% bolt-on and requires no drilling or cutting when installed using the factory horn button.
Kleinn’s own listing covers the four-door JLU only and explicitly excludes two-door models; major retailers such as Quadratec and JustJeeps additionally list fitment for the 2020+ Jeep Gladiator JT with the same 3.6L gas engine. The kit is aimed at JL owners who either already run onboard air or plan to add it — Kleinn designed the JL220 around its JL-JK-OBA onboard-air system, but any air source with at least 100 PSI and a 1-gallon tank that doesn’t conflict with the horn mounting location will drive it.
Specifications
| Spec | Value |
|---|---|
| Model | JL220 (SKU KL JL220 / Quadratec part 92043-1115) |
| Sound output | 154.2 dB at 150 PSI (test distance not disclosed) |
| Trumpets | 2 × Model 220, black high-impact ABS |
| Valving | Two air horn solenoids (included) |
| Kit format | Horn add-on only — compressor and tank sold separately |
| Air requirement | Minimum 100 PSI and 1-gallon tank; designed for Kleinn JL-JK-OBA |
| Mounting | Bolt-on bracket, passenger-side frame rail next to the transmission |
| Fitment | 2018+ Wrangler JL Unlimited 4-door, 3.6L gas; retailers also list 2020+ Gladiator JT 3.6L |
| Excluded | All 2-door JL models; 3.0L diesel and hybrid JLU |
| Activation | Factory horn button (no drilling/cutting) or included horn button |
| Shipping weight | 12 lb |
| Warranty | 1-year limited defect warranty |
| Price | $249.95 at Kleinn and Quadratec; $274.99 at ExtremeTerrain |
Two disclosure gaps are worth flagging. First, the 154.2 dB figure comes with an operating pressure (150 PSI) but no test distance, so treat it as a best-case marketing number — our guide on advertised vs real-world decibels explains why the distance matters more than the digits. Second, Kleinn publishes no chord frequencies or trumpet dimensions for the Model 220 horns, which makes on-paper comparisons against fully-specced competitors harder.
What’s in the box
- Two Model 220 train horn trumpets in black high-impact ABS
- Two air horn solenoids
- Custom direct-fit JLU mounting bracket with hardware
- Horn wiring with relay and a horn button (factory-button wiring is also supported)
There is no compressor, tank, or air line back to a tank in this kit — that’s the defining trade-off of the add-on format. If you don’t already have onboard air, Kleinn’s matching JL-JK-OBA system (a 3-gallon tank and 6450RC compressor that mount between the driveshaft and exhaust, per the installation manual) is the intended companion, and our onboard air uses guide covers what else that plumbing is good for once it’s on the Jeep.
Pros
- Strong claimed output — 154.2 dB at 150 PSI from a compact dual-trumpet setup
- Vehicle-specific frame-rail bracket: 100% bolt-on, no drilling or cutting when using the factory horn button
- Fires from the factory horn button, so the install stays stealthy with no extra switch clutter
- Unusually thorough documentation — a 40-page official installation manual with fitment chart, torque-check schedule, and maintenance intervals
- Works with any onboard-air system meeting 100 PSI / 1-gallon minimums, not just Kleinn’s own
- Tucked mounting location keeps the trumpets hidden and protected
Cons
- Horn-only kit — compressor and tank are sold separately and add substantially to the real cost of a complete system
- Decibel rating is published without a test distance
- Narrow fitment: four-door 3.6L gas models only — all 2-door JLs and the 3.0L diesel/hybrid JLU are excluded
- No chord frequency, trumpet length, or dimension specs disclosed
- One-year warranty, while Kleinn gives its 730 horns and 6450/6650 compressors two years
- The manual notes that ground wires and switch installs may still require drilling holes, despite the no-drill marketing headline
Alternatives
- Kleinn HK5 Mini Beast Dual — a complete dual-trumpet kit with compressor and tank included, for buyers who want one box instead of horn-plus-OBA; universal mounting rather than JL-specific. See our Kleinn HK5 review.
- Kleinn HK2 Compact Dual ProBlaster — Kleinn’s small-footprint complete kit for tight installs; a cheaper all-in-one path to a working system. See our Kleinn HK2 review.
- HornBlasters Outlaw 232 — the main cross-brand rival for a compact complete train horn kit, with HornBlasters’ large support ecosystem behind it. See our Outlaw 232 review.
If you’re still weighing platforms and kits, our best train horn for Jeep Wrangler guide compares the JL220 against the wider field.
Install / compatibility notes
The horns and solenoids bolt to the passenger-side frame rail next to the transmission using the supplied bracket. Quadratec rates the add-on install at level 2 (intermediate) and 1–2 hours, and ExtremeTerrain quotes roughly 45 minutes; if you’re installing the full JL-220 system with the JL-JK-OBA air package, Kleinn’s manual estimates 6–10 hours for a first-timer, since the tank and compressor mount under the vehicle between the driveshaft and exhaust. The manual’s quick outline runs from wiring, relay, and horn-switch install through tank brackets, compressor, air lines, and final testing — our step-by-step install guide and relay wiring guide cover the same ground in general terms.
Electrical is standard 12V relay-switched horn wiring, with the option to trigger from the factory horn button — the configuration that earns the “no drilling or cutting” claim. Note the manual’s fine print: depending on where you ground wires and mount switches, you may still end up drilling small holes.
On air: 100 PSI minimum and a 1-gallon tank minimum, though like every train horn, the JL220 will sound stronger and blow longer with more pressure and volume behind it — see our PSI guide and tank size guide for sizing logic. Kleinn’s manual is also clear on upkeep for the companion air system: drain tank moisture monthly or every 10 compressor hours, and re-check mounting fasteners yearly.
Fitment fine print, straight from the manual’s application chart: 2018-current JLU, all drivetrains, 3.6L engine, four-door body only. All two-door JLs and the 3.0L diesel/hybrid are explicitly excluded. Kleinn states the kit is compatible with OEM and leading aftermarket power steps, but has not been tested with aftermarket exhaust systems. Before you buy, also check your state’s rules in our train horn legality section, since a 150+ dB claimed horn on a road vehicle isn’t legal to blast everywhere.
Sources
- Kleinn — Jeep JLU Wrangler Black Dual Air Horn Add-On Kit product page — official specs: 154.2 dB rating, 100% bolt-on/no-drilling claim, 100 PSI + 1-gallon minimums, JL-JK-OBA compatibility, $249.95 price, SKU KL JL220, and 4-door-only fitment (2-door excluded)
- Kleinn — Warranty Information — One-Year Limited Defect Warranty terms and the extended two-year coverage that applies only to 6450/6650 compressors and 730 horns
- Custom Offsets — Kleinn KLN-JL220 Add-On Horn Kit — Kleinn dealer copy backing the 154.2 dB at 150 PSI rating and the “no drilling or cutting if installed using the factory horn button” claim
- Kleinn JL-220 Installation and Operation Manual (PDF, hosted by Quadratec) — application chart (2018-current JLU 3.6L 4-door; 2-door and diesel/hybrid excluded), mounting locations, 6–10 hour full-system estimate, drilling footnote, maintenance schedule
- Quadratec — Kleinn JL220 Bolt On Train Horn Kit listing — $249.95 price, part 92043-1115, kit contents, Gladiator JT fitment, level-2 / 1–2 hour install rating, 12 lb shipping weight
- ExtremeTerrain — Kleinn Model 220 Dual Air Horn Add-On Kit (KLJL220) — $274.99 price point, 2018–2026 JL 4-door listing, ~45-minute install estimate
- Offroad Alliance — Kleinn JL220 Train Horn Kit — black high-impact ABS trumpet material, $249.95 price cross-check
- Amazon — Kleinn Jeep JL & JLU Add-On Horn Kit (B07LFYPWGR) — retail availability cross-check
- YouTube — Installing Kleinn JK220 Air Horn Kit In Jeep Wrangler Rubicon JKU — install walkthrough of the sibling JK220 kit, which uses the same Model 220 horns on the previous-generation Wrangler
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
The cleanest way to put a real train horn on a four-door Wrangler JL or Gladiator JT — a vehicle-specific bolt-on bracket and factory-button wiring justify the premium, as long as you budget for the onboard-air system it requires.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Kleinn JL220 really?
- Kleinn rates the JL220 at 154.2 dB at 150 PSI, but publishes no test distance, so treat it as a best-case manufacturer claim. Real-world output at lower tank pressures will be lower, though it remains a genuine train-horn-class sound.
- Does the JL220 come with a compressor and air tank?
- No. It is a horn-only add-on kit with trumpets, solenoids, bracket, and wiring. You need an onboard-air system with at least 100 PSI and a 1-gallon tank — Kleinn designed it around its JL-JK-OBA system, but any compatible air source works.
- Will the JL220 fit a 2-door Wrangler or a diesel JLU?
- No. Kleinn's application chart limits fitment to the four-door JL Unlimited with the 3.6L gas engine and explicitly excludes all 2-door JLs and the 3.0L diesel/hybrid models.
- Can the JL220 use the factory horn button?
- Yes. Wired through the factory horn button, the install is 100% bolt-on with no drilling or cutting, per Kleinn. A separate horn button is also included if you prefer a dedicated trigger.
- Does the JL220 fit the Jeep Gladiator JT?
- Kleinn's own page lists the four-door Wrangler JLU only, but major retailers including Quadratec and JustJeeps list fitment for the 2020+ Gladiator JT with the 3.6L gas engine. Confirm your exact model year with the retailer before ordering.
