- +Harley-specific bracket reuses the factory cowbell cover for a near-stock look
- +Tankless direct-drive compressor: no tank, pressure switch or drain valve
- +Triggers from the stock handlebar horn button
- +Detailed 22-page install guide plus Kleinn's own Road Glide install video
- +4.92/5 from 12 owner reviews on Kleinn's store (small sample)
- −132 dB rating has no test distance or PSI
- −No published PSI, Hz, dimensions, weight or amp draw
- −Product page says single-bolt hand-tool install; guide requires grinding the cowbell mounting hole
- −Sharp compact air horn tone, not a train-horn sound
- −1-year limited warranty excludes exposure to the elements
- −About 3x the price of Kleinn's universal Model 6126 kit with the same horn part
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: October 14, 2026. Specs come mainly from Kleinn’s HOGKIT-1 and HOGKIT-1BK product pages, Kleinn’s HOGKIT-1 install guide (Revision A, dated 07/13/2026), Kleinn’s warranty page, and Kleinn’s page for the Model 6126 horn kit, which the install guide names as the horn in this kit. We checked price and specs against listings from Desert Rat, LiftKits4Less, and Coyote Direct. We also reviewed two Kleinn YouTube videos. Where Kleinn’s product page and install guide disagree, we point it out.
Quick verdict
The HOGKIT-1 is a name-brand air horn kit built for one platform: Harley-Davidson bikes with the classic “cowbell” horn cover. It hides a tankless compressor under the factory cover and runs off the stock handlebar horn button, so the bike keeps a near-stock look. The downsides are thin data and a sales pitch that skips some work. Kleinn quotes 132 dB with no test distance or pressure, publishes no PSI, size, weight, or frequency figures, and its product page promises a single-bolt, hand-tool install, while its own install guide says you must grind the cowbell mounting hole. We rate it 3.7/5. It is a clean, model-specific upgrade for Harley riders, but it does not offer a train-horn sound, and the paperwork could be better.
What it is
The Kleinn HOGKIT-1 is a bolt-on dual air horn kit that replaces the factory electric horn on 1979-2020 Harley-Davidson motorcycles that use the cowbell-style horn cover. Kleinn sells two versions:
- HOGKIT-1: polished chrome trumpets, $249.95 (Kleinn part number KL HOGKIT-1)
- HOGKIT-1BK: black trumpets, $229.95
The kit has no air tank. Kleinn describes the system as two air horns “driven by a powerful, compact direct-drive air compressor.” On a direct-drive horn, the compressor only spins up when you press the horn button and blows straight into the trumpets. Nothing is stored under pressure. That keeps the kit small enough to fit behind the cowbell. The tradeoff is a sharp, instant blast rather than the long, deep note of a tank-fed train horn.
Desert Rat lists the compressor at 1.4 CFM. The install guide lists the horn as Kleinn part 6126 (6126B for black), which is the same horn Kleinn sells on its own as the Model 6126 universal tankless dual horn kit. In our editorial view, the HOGKIT-1 is that universal horn plus a Harley-specific bracket, clamp, and wiring harness, packaged so the factory cowbell fits back over the compressor.
This is a compact air horn, not a train horn. Two short trumpets fed by a direct-drive compressor are built to be loud and sharp, not to make a deep locomotive chord. For background on why the formats sound so different, see our guide to train horns vs electric horns. For the bigger picture on bikes, see train horns on motorcycles.
Specifications
| Spec | Value |
|---|---|
| Model / part number | HOGKIT-1 (KL HOGKIT-1); black version HOGKIT-1BK |
| UPC (chrome) | 819147010847 |
| Sound output | 132 dB (test distance and pressure not disclosed) |
| Horn count | 2 trumpets |
| Trumpet lengths | 8.5 in. and 6.5 in. (per Kleinn’s Model 6126 page) |
| Horn material | Chrome-plated zinc alloy (per Kleinn’s Model 6126 page) |
| Finish | Polished chrome (HOGKIT-1) or black (HOGKIT-1BK) |
| Air source | Direct-drive compressor (Kleinn part DD1), no tank |
| Compressor flow | 1.4 CFM (retailer-listed) |
| Operating PSI | Not disclosed |
| Chord frequencies | Not disclosed |
| Dimensions / weight | Not disclosed |
| Voltage | 12 V (bike electrical system) |
| Wiring | Fused 12 ga power and ground to the battery; 18 ga trigger wire to the factory horn wire |
| Fitment | 1979-2020 Harley-Davidson models with the factory cowbell horn cover |
| Install time | 1-4 hours, wiring not included (per install guide) |
| Warranty | 1-year limited, original purchaser |
| Price | $249.95 chrome, $229.95 black (Kleinn MSRP) |
| Kleinn store rating | 4.92/5 from 12 reviews (as of 10/14/2026) |
- Rated output
- 132 dB (no distance given)
- Air supply
- Tankless direct drive, 1.4 CFM
- Fitment
- 1979-2020 H-D with cowbell cover
- Price
- $249.95 chrome / $229.95 black
What’s in the box
Kleinn’s install guide lists these parts:
- DD1 direct-drive compressor
- Dual air horn for direct-drive compressors, part 6126 (6126B in black)
- Main horn and compressor bracket (HOGKIT-1-BRKT) and clamping plate (HOGKIT-1-PLATE)
- Pre-cut air tubing and a fitting pack
- Harley-Davidson wiring harness with a fused red 12 ga lead
- Hardware: zinc hex bolts, flat and split-lock washers, acorn nuts, a square-head bolt, rubber washers, an aluminum spacer, a 2 in. vinyl-coated steel clamp, and 6 in. of rubber U-trim
You reuse your factory cowbell cover and the OEM horn mounting nut. Neither comes in the box.
Pros
- Built for one platform: the bracket reuses the factory cowbell cover and the OEM horn stud, so the bike looks close to stock
- Tankless direct-drive design, so there is no tank, pressure switch, or drain valve to find room for on a motorcycle
- Wired to the stock horn button, with no extra switch on the handlebars
- Free 22-page install guide with a parts list, hardware sheets, and step-by-step photos, plus Kleinn’s own install video on a Road Glide
- Strong early owner feedback: 4.92/5 from 12 reviews on Kleinn’s store, a small sample
- Black version costs $20 less if you want a stealthier look
Cons
- The 132 dB rating has no test distance or pressure, so you can’t fairly compare it with other horns
- No published PSI, frequencies, dimensions, weight, or amp draw for the kit or the DD1 compressor
- Kleinn’s product page promises a single-bolt, hand-tool install, but the install guide says you must elongate the cowbell’s upper mounting hole with a file or rotary tool
- Sharp compact air horn tone, not a deep train-horn sound
- Only a 1-year limited warranty, which does not cover “exposure to the elements,” a real concern on a motorcycle
- Costs about three times Kleinn’s own $79.95 universal Model 6126 kit, which uses the same horn part number
Alternatives
- Kleinn Model 6126 universal tankless dual horn kit. The same dual chrome horn family, also rated 132 dB by Kleinn, for $79.95. It includes a relay, tubing, and brackets. You give up the Harley bracket and harness, so you have to fabricate the mount, but it costs much less if you’re comfortable with that.
- Wolo Bad Boy 419. A self-contained 12 V dual-tone air horn for riders who want a cheaper, simpler upgrade and can mount it somewhere other than the cowbell. See our Wolo Bad Boy 419 review.
- Kleinn HK1 ProBlaster Mini. If you have saddlebag or trike space for a small tank, Kleinn’s mini dual kit uses a tank-fed compressor instead of direct drive. See our Kleinn HK1 review. For a true dual train-horn bell, look at the Kleinn Model 220 Mini Beast, though it needs a full air system that most bikes can’t hold.
You can browse the whole lineup on our Kleinn brand hub.
Install / compatibility notes
Check fitment first. Kleinn lists 1979-2020 Harley-Davidson models with the factory cowbell horn cover. Its install guide adds two limits. The cowbell has to sit between the cylinders on the left side of the bike. It also needs a center mounting bar across the back with two holes, upper and lower. Retailers don’t fully agree on years. Coyote Direct’s listing says “79-24,” LiftKits4Less and Desert Rat say “1979 to current,” and Coyote’s long fitment table even includes the 2020 LiveWire. In our view, Kleinn’s own 1979-2020 range and the physical cowbell checks are what to trust. Confirm your bike before you order.
Expect to modify the cowbell. The product page calls installation “straightforward” with “common hand tools.” The install guide disagrees. It says the kit “requires modification of the OEM Factory horn cover.” You remove the cover’s clip-on barrel nuts and file or grind the upper mounting hole into an oval. The guide’s tool list includes a rotary tool with a grinding bit, a heat gun, a multimeter, and touch-up paint. Kleinn rates the job as needing “moderate mechanical aptitude” and estimates 1-4 hours, not counting wiring.
Assembly order. Assembly happens mostly on the bench:
- Remove the OEM horn and keep the acorn nut and washer.
- Take the cowbell apart and elongate its upper mounting hole.
- Unscrew both trumpets, then mount the horn driver to the main bracket with the clamping plate and rubber washers.
- Seat the compressor inside the cowbell, then secure it with the vinyl-coated clamp and rubber U-trim.
- Run tubing from the compressor outlet to the horn’s barbed fitting.
- Choose which trumpet goes in the upper slot, refit both trumpets, and bolt the assembly to the OEM stud at factory torque.
The guide notes that the bracket moves the cowbell back slightly to make room for the longer trumpets.
Wiring. The harness runs a fused red 12 ga wire to the battery positive, a 12 ga black wire to the battery negative, and an 18 ga purple trigger wire to the positive side of the factory horn wire. The compressor terminals are polarity-marked, and Kleinn warns that they must be connected correctly. Wired this way, the horn works from the stock handlebar button. Kleinn doesn’t publish the compressor’s amp draw. If your bike has a tight electrical budget or a CAN-bus system that monitors the horn circuit, ask Kleinn before you install. Our relay wiring guide covers the basics of feeding a horn straight from the battery.
Legality. A louder horn on a motorcycle is usually treated as an aftermarket warning device, but state horn rules vary. See are train horns legal on cars and check your state before you use it on the road.
Sources
- Kleinn — HOGKIT-1 Bolt-On Chrome Dual Air Horn Kit for 1979+ Harley-Davidson — 132 dB rating, parts included, direct-drive/no-tank design, single-bolt and hand-tool wording, 1979-2020 cowbell fitment, $249.95 price, UPC, 4.92/5 from 12 reviews, warranty summary, product photos
- Kleinn — HOGKIT-1BK Bolt-On Black Dual Air Horn Kit — black version, $229.95 price, same 132 dB and fitment claims
- Kleinn — HOGKIT-1 Install Guide, Revision A (PDF) — cowbell modification requirement, cowbell location and mounting-bar limits, tool list, 1-4 hour estimate, moderate-aptitude rating, full parts list (DD1, 6126/6126B, brackets, hardware), assembly steps, wire gauges and connections, warranty terms, revision date
- Kleinn — Warranty Information — 1-year limited warranty, original purchaser, exclusions and labor-cost terms
- Kleinn — Model 6126 Universal Tankless Dual Chrome Air Horn Kit — 8.5 in. and 6.5 in. trumpets, chrome-plated zinc alloy construction, 132 dB rating, relay/tubing/brackets included, $79.95 price
- Desert Rat — Kleinn HOGKIT-1 Dual Horn Kit — 1.4 CFM direct-drive compressor, “1979 to current” fitment wording, $249.95 price cross-check
- LiftKits4Less — Kleinn HOGKIT-1 HogKit Harley Davidson Horn Kit — $249.95 price cross-check, part number, product description
- Coyote Direct — Kleinn 79-24 Harley-Davidson Horns w/ Cowbell Horn Cover — “79-24” fitment wording and broad fitment table (including LiveWire), $249.95 price, 132 dB claim
- YouTube — Kleinn: How to Install a Kleinn Air Horn on a Harley Road Glide (Hog Kit Full Install) — manufacturer install walkthrough on a Road Glide
- YouTube — Kleinn: HOGKIT-1, A Harley Davidson Horn Upgrade — manufacturer product overview and sound demo embedded on the product page
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
The HOGKIT-1 suits Harley riders with a cowbell horn cover who want a loud, factory-looking dual air horn that works from the stock button. Budget for light grinding on the cowbell, and don't expect a train-horn tone.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Kleinn HOGKIT-1?
- Kleinn rates the HOGKIT-1 at 132 dB. It does not give the test distance or air pressure, so treat that number as a manufacturer claim. It can't be compared directly with horns rated at a stated distance.
- Does the HOGKIT-1 fit my Harley?
- Kleinn lists 1979-2020 Harley-Davidson models with the factory cowbell horn cover. Its install guide adds that the cowbell must sit between the cylinders on the left side and have a center mounting bar with upper and lower holes. Some retailers list wider year ranges, so check your bike against Kleinn's criteria.
- Is the HOGKIT-1 really a no-modification bolt-on?
- Not quite. Kleinn's product page describes a single-bolt, hand-tool install, but Kleinn's install guide says you must remove the cowbell's clip-on barrel nuts and file or grind the upper mounting hole into an oval. Kleinn estimates 1-4 hours, not counting wiring.
- Does the HOGKIT-1 need an air tank?
- No. It uses Kleinn's DD1 direct-drive compressor, which Desert Rat lists at 1.4 CFM. The compressor runs only while you press the horn button and blows straight into the two trumpets, so nothing is stored under pressure.
- What is the difference between the HOGKIT-1 and HOGKIT-1BK?
- Only the finish and the price. The HOGKIT-1 has polished chrome horns at $249.95, and the HOGKIT-1BK has black horns at $229.95. Kleinn lists the same 132 dB rating, fitment and parts for both.
