- +True 100% bolt-on install — no drilling, cutting, or welding on the truck
- +Model 730 Demon stainless-steel triple horns, advertised at 157.89 dB
- +6450RC waterproof compressor is rated 100% duty cycle at 200 PSI
- +Doubles as full onboard air: tire inflation, air tools, air suspension
- +Tank and powder-coated brackets are made in the USA
- +Extended two-year warranty on the 6450 compressor and 730 horns
- −Expensive: $1,229.99 at AmericanTrucks and $1,529.95 direct from Kleinn
- −157.89 dB figure is published without a test distance
- −Fitment listings conflict across retailers (years, F-450, Tremor exclusion)
- −Several retailer listings describe it as a 6.7L diesel-specific kit
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: August 16, 2026. Specs below come from Kleinn’s official product pages, AmericanTrucks, Stage 3 Motorsports, Summit Racing, Amazon listings, a published install video, and Ford truck forum threads — every source is listed at the end.
Quick verdict
The Kleinn SDKIT17-734 is one of the most complete vehicle-specific train horn packages you can buy for a Ford Super Duty, and it earns a 4.3/5 from us. You get Kleinn’s flagship Model 730 Demon stainless-steel triple horns (advertised at 157.89 dB), a 200 PSI waterproof 6450RC compressor rated for 100% duty cycle, a 3-gallon US-made tank, and truck-specific powder-coated brackets that bolt on with zero drilling. The catch is price — $1,229.99 at AmericanTrucks, $1,529.95 direct from Kleinn — and a fitment picture that genuinely differs depending on which retailer you read. If your truck is on the list, this is editorially the strongest bolt-on Super Duty kit in Kleinn’s lineup.
What it is
The SDKIT17-734 is a direct-fit, bolt-on train horn and onboard air system engineered for the 2017-generation Ford Super Duty (F-250/F-350, with F-450 coverage varying by listing). It pairs the same Model 730 Demon triple horn we covered in our standalone Kleinn Demon 730 review with a full onboard air system: Kleinn’s 6450RC heavy-duty waterproof compressor, a 3-gallon steel air tank, 1/2-inch high-flow airline, and an INF-1 quick-connect tire inflator with hose and storage bag.
It’s aimed at Super Duty owners who want two things at once: a locomotive-grade horn and a real onboard air source for inflating oversized tires (Kleinn’s product page quotes capability up to 39-inch tires for the 734-series system), running air tools, or feeding air suspension. Because every bracket is bent for this specific chassis, the install is advertised as 100% bolt-on — no drilling, no cutting, no welding. This is the same direct-fit formula as Kleinn’s GMTRK-1 kit for GM trucks and JL220 for Jeep Wrangler, scaled up to Kleinn’s loudest horn.
On Kleinn’s own site the kit is sold on one product page with three options: the Model 730 system (SKU KL SDKIT17-734, $1,529.95), a cheaper Model 230 ABS-horn version (SDKIT17-230), and an air-only system with no horns (SD17OBA-6450). There is also a spare-tire-location variant, SDKIT17-734STL, listed at $1,399.95, which mounts the horns where the spare tire lives.
Specifications
| Spec | Value |
|---|---|
| Horn | Model 730 Demon triple, stainless-steel trumpets (black) |
| Advertised output | 157.89 dB (test distance not disclosed) |
| Compressor | Kleinn 6450RC, waterproof, 100% duty cycle |
| System pressure | 140–200 PSI horn operating range; 200 PSI compressor rating |
| Air tank | 3-gallon steel, made in USA |
| Airline | 1/2” max-flow line (734 series) |
| Tire inflation | Rated for tires up to 39” per Kleinn’s product page |
| Inflator | INF-1 quick-connect kit with long hose and storage bag |
| Brackets | Vehicle-specific, powder-coated, made in USA |
| Install | Bolt-on; no drilling; retailer-estimated ~1 hour, light-to-moderate skill |
| Warranty | 1-year limited; extended 2-year on 6450 compressor and 730 horns |
| Price | $1,229.99 (AmericanTrucks) / $1,529.95 (kleinn.com) |
- Loudness claim
- 157.89 dB (no distance disclosed)
- Duty cycle
- 100% — continuous run
- Tank
- 3 gallons
- Install
- Bolt-on, no drilling
What’s in the box
- Model 730 Demon triple train horn with trumpet supports
- 6450RC heavy-duty waterproof air compressor
- 3-gallon steel air tank
- Vehicle-specific powder-coated air-system and horn brackets, plus nut plate
- Pressure switch, heavy-duty solenoid valve, and 1/2” airline
- Wiring harness with relay and horn button
- INF-1 quick-connect tire inflator with hose and storage bag
- Mounting hardware and fittings
Pros
- Genuine 100% bolt-on install for the Super Duty — no drilling into a $70K truck
- Flagship stainless-steel Demon 730 horns; among the loudest advertised figures in the consumer market
- 100%-duty-cycle 6450RC compressor means it can run continuously without thermal cutout drama
- Full onboard-air functionality: tires, tools, suspension — not just horn duty
- Tank and brackets made in the USA, with a 2-year extended warranty on the big-ticket components
- Forum installers report clean factory-like packaging behind the front bumper
Cons
- At $1,229.99–$1,529.95 it costs as much as three universal kits
- The 157.89 dB claim ships with no test distance, so it can’t be compared apples-to-apples
- Fitment is retailer-dependent — years, trims, and F-450 coverage differ between listings
- Multiple retailer pages describe the kit around the 6.7L Power Stroke diesel; gas-engine owners should confirm before ordering
Alternatives
- HornBlasters Conductor’s Special 544 — the universal-fit route: Shocker XL quad horns with a 100%-duty air system, usually cheaper, but you fabricate your own mounting. See our Conductor’s Special 544 review.
- Kleinn SDKIT17-230 — same bolt-on brackets and onboard air on the same product page, but with ABS Beast 230 horns, a 150 PSI 6350RC compressor and 1/4” line; the sensible step-down if the 734’s price stings.
- Kleinn Demon 730 standalone — if you already have onboard air, the horn alone is the star of this kit; our Demon 730 review covers it in detail. More Kleinn coverage lives in our Kleinn reviews hub.
Install / compatibility notes
This is where you must slow down, because fitment for this kit is retailer-dependent and the listings do not agree:
- AmericanTrucks: 2017–2022 F-250 Super Duty, excluding Tremor
- Stage 3 Motorsports: 2017–2020 F-250 and F-350
- Amazon (SDKIT17-734 listing): 2017–2021 F-250/F-350 and 2017–2019 F-450
- Kleinn’s own product page: 2017–2022 F-250/F-350/F-450; the spare-tire-location SDKIT17-734STL variant is listed for 2017–2026 Super Duty trucks
Our read: the core brackets were engineered for the 2017-generation chassis, and each retailer certifies only the years it has validated. Order from the retailer whose listing explicitly names your year, model, and trim — or call Kleinn with your VIN. Note also that Stage 3 and several other listings frame the kit around the 6.7L Power Stroke; if you run a gas engine, confirm clearance before buying. Kleinn sells a separate kit for 2023+ Super Duty trucks, so 2023+ owners should look there instead.
Electrically, the kit wires like any big compressor system: a fused feed from the battery, a relay-driven compressor circuit managed by the pressure switch, and a horn button (installers on Ford Truck Enthusiasts report using a factory upfitter switch instead — a clean touch on Super Dutys). A published install video for the 2017–2018 trucks walks the whole job; AmericanTrucks estimates about an hour with light-to-moderate mechanical skill, though forum accounts suggest budgeting an afternoon. A 140–200 PSI air system is what the Demon 730 wants for full output — see our guide to what your onboard air can do beyond the horn and why 100% duty cycle matters. And before your first blast in traffic, skim where train horns are street-legal.
Sources
- Kleinn — Direct Fit Train Horn and Onboard Air Systems for 2017-2022 Ford F-250/F-350/F-450 — official specs: SKU/variants, $1,529.95 price, 230 vs 734 series comparison, 6450RC 200 PSI compressor, 1/2” airline, 39” tire inflation, made-in-USA tank and brackets, warranty terms, bolt-on claims
- Kleinn — Model 730 “Demon” Stainless Steel Triple Train Horns — stainless-steel construction, 140–200 PSI air-system requirement
- Kleinn — Spare Tire Location Bolt-On Train Horn Systems for 2017-2026 Ford Super Duty — SDKIT17-734STL variant, $1,399.95 list price, spare-tire mounting
- AmericanTrucks — Kleinn F-250 Direct Fit Onboard Air System and Model 730 Demon Triple Train Horn SDKIT17-734 — $1,229.99 price, 2017-2022 F-250 excl. Tremor fitment, 157.89 dB claim, included items, ~1 hour install estimate
- Stage 3 Motorsports — 2017-2020 F250 & F350 Kleinn SDKIT17-734 — 2017-2020 F-250/F-350 fitment, 6.7L Power Stroke framing, 6890 Ultra Blast valve upgrade option
- Amazon — Kleinn Air Horns Train Horn Kit for 2017-2021 F-250 and F-350 / 2017-2019 F-450 — alternate fitment years, retail cross-check
- Summit Racing — Kleinn SDKIT17-734 — retail availability cross-check
- Kleinn — SDKIT17-230/734 installation manual (PDF) — install procedure and included hardware
- YouTube — How to Install Kleinn air horns SDKIT17-734 for 2017 & 2018 Ford Super Duty F250-F350 — full install walkthrough
- Ford Truck Enthusiasts forum — Kleinn Air Horn Installation — user reports: upfitter-switch activation, behind-bumper horn placement, loudness impressions
- Power Stroke Nation forum — Installed the new Kleinn SD Train Horn kit for 2017+ — user report: easy install, Kleinn support experience
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
The SDKIT17-734 is the right pick for a 2017+ Ford Super Duty owner who wants a maximum-loudness train horn plus a genuine 100%-duty onboard air system in one no-drill, vehicle-specific package — as long as they verify their exact year/trim fitment before ordering, because retailer listings disagree.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Kleinn SDKIT17-734 really?
- Kleinn's retailers advertise the Model 730 Demon horns in this kit at 157.89 dB, but no test distance is published with that number. Real-world loudness at the curb will be lower and depends on mounting location and tank pressure, though user reports consistently describe it as extremely loud.
- Which Ford trucks does the SDKIT17-734 fit?
- It depends on where you buy: AmericanTrucks lists 2017-2022 F-250 excluding Tremor, Stage 3 Motorsports lists 2017-2020 F-250/F-350, Amazon lists 2017-2021 F-250/F-350 plus 2017-2019 F-450, and Kleinn's own page covers 2017-2022 F-250/F-350/F-450. Verify your exact year and trim with the retailer or Kleinn before ordering; 2023+ trucks use a different Kleinn kit.
- Can the SDKIT17-734 air up tires and run air tools?
- Yes. The 6450RC compressor is rated for 100% duty cycle at up to 200 PSI with a 3-gallon tank, and Kleinn quotes tire inflation capability up to 39-inch tires for the 734 series. The kit includes an INF-1 quick-connect inflator with hose and storage bag.
- Does installing it require drilling into the truck?
- No. The kit uses vehicle-specific powder-coated brackets and is advertised as 100% bolt-on with no drilling, cutting, or welding. AmericanTrucks estimates about one hour of install time with light-to-moderate mechanical skill, though forum installers suggest allowing longer.
- What warranty does Kleinn provide on this kit?
- Kleinn's product page lists a one-year limited defect warranty on the kit, with extended two-year coverage on the 6450-series compressor and the Model 730 horns.
