KL SDKIT17-734STL-NOB - BOLT-ON STEEL TRAIN HORN / ONBOARD AIR KIT - 2017-2026 FORD F-250 / F-350 / F-450

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KL SDKIT17-734STL-NOB

Regular price $1,119.96
Sale price $1,119.96 Regular price $1,399.95

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KL SDKIT17-734STL-NOB - BOLT-ON STEEL TRAIN HORN / ONBOARD AIR KIT - 2017-2026 FORD F-250 / F-350 / F-450 New Open Box [PNXXXX-NOB]


Previously opened boxes that have been reboxed. NOB-Stock goods have the same 1-year warranty as all other Kleinn products.

Model SDKIT17-734STL: Spare Tire Location Onboard Air & Triple Train Horn System

Built For Modified Rigs. Engineered To Dominate.

Standard horn kits assume your truck is straight off the factory floor—but your build is anything but stock. The Kleinn Automotive Accessories SDKIT17-734STL Steel Triple Train Horns and Onboard Air System is the ultimate, uncompromising solution for Ford Super Duty owners running oversized off-road tires, aggressive aftermarket bumpers, or heavy-duty behind-the-bumper winches.

When modifications take up valuable under-chassis real estate, this premium system saves the day. By utilizing vehicle-specific, powder-coated steel brackets, it intelligently reclaims the factory spare tire cavity to mount the legendary Kleinn 730 Demon™ train horns. The air tank and compressor seamlessly tuck into the surrounding spaces without interfering with your aftermarket upgrades. The result? A completely hidden, high-performance stealth installation that protects your gear from road debris while delivering a true 100% bolt-on fit—meaning absolutely zero cutting, drilling, or welding on your truck's frame.

The Ultimate Onboard Air Command Center

Don't settle for basic horn kits that only make noise—this system transforms your rig into a fully functional, mobile pneumatic powerhouse. At the heart of this heavy-hitting package is a genuine Kleinn heavy-duty, 100% duty-cycle waterproof air compressor paired with a high-capacity air tank.

This creates an incredibly versatile onboard air station engineered for real-world utility. Whether you need to air up large off-road trail tires after a weekend of wheeling, manage air suspension helper bags on the fly, or run pneumatic air tools right from your truck bed, this system delivers instant, reliable high-pressure air on demand. Every chassis-specific bracket, high-pressure airline, and premium hardware component is precision-engineered to tuck completely out of sight, providing clean, stealthy integration while offering maximum defense against harsh road debris, mud, and the elements.

Professional-Grade Durability, Stealth Bolt-on Design

You shouldn't have to sacrifice your truck's clean factory lines to get massive acoustic power. This complete onboard air and train horn system delivers the ultimate combination of high-output performance and a discreet, factory-style aesthetic.

Engineered specifically to survive the most punishing conditions, every component is strategically tucked away to maintain your rig's clean look while keeping the hardware safe from mud, water, and road debris. It is the perfect, low-profile upgrade for serious custom truck builds that demand maximum dependability without the cluttered look of universal kits.

Highlights for SDKIT17-734STL: Ford super-duty 2017-2026

  • Custom Mounting Brackets: Direct-Fit No-Drill Infrastructure. These vehicle-specific, heavy-duty steel mounting plates feature a durable black powder-coated finish and bolt directly into existing factory frame holes, providing a rock-solid, custom-fit foundation engineered specifically for proprietary, genuine Kleinn components.
  • Strategic Multi-Zone Space Allocation: Brackets locate the air tank along the crossmember in front of the spare tire area, tuck the compressor safely on the passenger side inner frame rail, and position the massive horns directly in the empty factory spare tire pocket.
  • Model 730 Demon™ Triple Steel Train Horns: Precision-tuned detachable triple stainless steel trumpets with custom mounting configuration footprint, shipped on flat-rack bar. These horns receive air from a high-flow VX6003 brass solenoid and heavy-duty 1/2" airline to deliver an authentic, window-rattling locomotive roar.
  • Model 6450RC Waterproof Air Compressor: Industry-exclusive fully sealed pump delivering up to 200 PSI with a 100% duty-cycle, engineered to operate flawlessly in harsh, moisture-heavy under-truck environments.
  • Model 6351RT 3-Gallon Air Tank: Specialized heavy-gauge steel multi-port reservoir treated with an internal Cortec anti-corrosion coating to eliminate rust and protect downstream components. 
  • Premium INF-1 Tire Inflation Station: Includes a pro-grade inflation setup featuring a 24' heavy-duty air hose with pre-attached quick-connect couplers, a custom analog glow-gauge inflator, a secure clip-lock chuck, and an integrated pressure-release button.
  • 1302 Quick-Connect Relocation Architecture: Fully equipped with a dedicated bumper/hitch mounting bracket layout, 12 ft of specialized high-pressure airline, and premium adapter fittings designed to position the inflation port cleanly under your bumper or next to your trailer hitch receiver.
  • Installation Pack: 1/2" OD high-pressure airline, automated pressure switch, high-pressure tank fittings, wiring kit, mounting hardware, and horn button. 

For the ultimate locomotive experience, add the Ultra BlastMaster Upgrade Kit. Boost output by 30% with Model 6890 by doubling the airflow using dedicated 1/2" lines and individual high-flow brass solenoids for each train horn.

Train Horn Specifications

Triple Steel Train Horns
Part Number Model (730) “The Demon"
Number of Horns 3 (Flat Rack or Individual Mount)
Warranty 2-Year Warranty
Construction Stainless Steel Trumpets
Brass Solenoid P/N VX6003 (12-Volt)
Max Pressure 200 PSI
Output (dB) 157.8 dB (159.6 dB w/ 6890 Upgrade Kit)
Rack Dimensions 22.5” L x 18.5” W x 7.25” H
Trumpet Lengths 21.75”, 17.75”, 13.5”
Airline Size 1/2" OD Airline

Air Compressor Specifications

Feature Feature Details
Part Number Model 6450RC
Warranty 2-Year Extended (6450RC, 6650RC, & 730)
Max Pressure 200 PSI
Duty Cycle 100% @ 100 PSI (@ 72° F)
Flow Rate @ 0 PSI (13.8 Volts): 2.1 CFM
Compressor Type Waterproof Sealed, Oil-less
Voltage 12-Volt DC
Motor Type Permanent Magnetic Motor
Max Tank Size 7.0 Gallon
Max Amp Draw 23 Amps
Dimensions 11.25” L x 4” W x 6.50” H
Mounting Holes 8.90” L x 3.31” W (5mm Diameter)
Mounting Note Mountable in any position except upside down
Shipping Weight 12 lbs
Pressure Switch P/N 2151 (Works with 52175 Safety Valve)

Air Tank Specifications

Slim Mount Air Tank Model 6351RT
Warranty 1-Year
Tank Capacity 3-Gallon
Construction All Steel Design (Gloss Black Epoxy Finish)
Internal Coating Cortec Internal Anti-Corrosion Coating
Mounting Legs 2 Legs w/ 4 Mounting Points
Air Tank Ports Five - 1/4" NPT Ports & One - 3/8" NPT Ports
Mounting Hardware Fitting Pack - 4 Bolts, Nuts, Washers
Max Pressure 200 PSI
Dimensions 27” L x 6” W x 8” H

Air Tank Fill Rates

Tank Capacity Pressure Range Fill Rate
2.5 Gallon 0 - 150 PSI 2 Min. 54 Sec. (+/- 10 Sec.)
2.5 Gallon 110 - 150 PSI 54 Sec. (+/- 5 Sec.)
5 Gallon 0 - 150 PSI 5 Min. 57 Sec. (+/- 10 Sec.)
5 Gallon 110 - 150 PSI 1 Min. 53 Sec. (+/- 5 Sec.)

Installation Links:

Does it come with a warranty?

One-Year Limited Defect Warranty for Kleinn Automotive Accessories:

Kleinn Automotive Accessories is committed to delivering high-quality products to our customers. We stand behind the craftsmanship and materials of our products by offering a comprehensive one-year limited warranty. This warranty is extended to the original purchaser, ensuring that when our products are installed properly and used under standard conditions, they will be free from defects in workmanship and materials for a period of one year from the original date of purchase.

This warranty encompasses a promise that the product you have purchased will perform as expected under normal use conditions and will not suffer from flaws in materials or craftsmanship. However, it is important to note that this warranty does not cover any damage that results from abusive use, operation that is not in line with the product’s intended purpose, or harm resulting from exposure to harsh environmental conditions. In the event that a product is found to be defective within the warranty period following a thorough inspection, Kleinn Automotive Accessories reserves the right to either repair or replace the defective item at no additional charge to the purchaser. It is our goal to ensure that our products meet the high standards that our customers expect, but we also want to clarify that Kleinn is not responsible for covering any costs related to the installation of our products, nor are we liable for any loss or damage that may occur as a result of the repair or replacement process of any product under warranty.

Extended Two-Year Warranty for Select Products:

Understanding the specific needs of our customers and the demands placed on certain products, Kleinn Automotive Accessories is pleased to offer an exclusive extended two-year warranty for our 6450/6650 Compressors and 730 Horns. This special warranty extension reflects our confidence in these products’ durability and performance. Eligible products under this extended warranty will enjoy all the benefits of our standard one-year warranty with an additional year of protection, totaling two years from the date of purchase. This extended warranty coverage ensures that these specific models, recognized for their robustness and reliability, receive the extra assurance customers desire for these critical components.

Detailed Warranty Return Procedure:

Should you need to initiate a return under the warranty, we have a straightforward process designed to make it as convenient as possible for our valued customers. To start, you will need to email a copy of your sales receipt, which must be dated within the past year for standard warranty claims or within the past two years for claims under the extended warranty for the 6450 Compressors and 730 Horns. This email should be directed to our Warranty Manager and include your full name, email address, telephone number, and a concise description of the problem you are experiencing.

Upon receipt of your email, a dedicated representative from Kleinn Automotive Accessories will reach out to you directly. Our first step will always be to attempt to resolve the issue through technical support, aiming to provide a quick and effective solution. If the problem cannot be addressed remotely, our representative will issue a Return Authorization number. This number is crucial as it will identify your return throughout the inspection process. You are then required to send the product back to Kleinn Automotive Accessories for a comprehensive physical inspection.

Upon inspection, if the product is determined to be defective due to issues in workmanship or materials, Kleinn will undertake to either repair or replace the product at our discretion. We are committed to ensuring that our customers receive products that meet our high-quality standards, and we will make every effort to resolve warranty claims to your satisfaction. However, if the inspection reveals that the product does not have a material defect, we will return the unit to the customer. In such cases, the shipping costs for the return will be the responsibility of the customer.

Kleinn Automotive Accessories
4045 N. Highway Drive, Tucson, AZ 85705
Tel (520) 579-1531

What's the returns policy?

How To Return An Item

Your item must be in its original unused condition to be returned, unless there is a manufacturer defect. You must return the item within 30 days of your purchase.

1. Please email support@kleinn.com to request a refund and we will assign you a Return Authorization #.

2. Mail your returned item to:
Kleinn Automotive Accessories
Returns Department
4045 N Highway Drive
Tucson, AZ 85705

3. Include in your package a signed letter stating the reason for your return and the original receipt.

Return Non-Exceptions

Merchandise that has been worn, used, or altered will not be accepted for return or exchange.

Restocking Fee

All returns are subject to a 15% restocking fee, which will be deducted from your refund. If shipping and handling fees were applied to your order, they are non-refundable.