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KL 6890
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ENGINEERED EXCLUSIVELY FOR DEMON™ MODEL 730 HORNS
Experience your high-output train horns in all their true acoustic glory with the premium Kleinn Model 6890 Ultra BlastMaster™ Upgrade Kit. While standard multi-bell setups face structural flow caps, this high-performance engineering package entirely resets the baseline for extreme pneumatic delivery. By completely re-engineering the internal airflow mechanics of your existing Demon™ 730 assembly, this kit forces the maximum volume of air directly into the trumpets simultaneously. The physics are simple: more air volume equals more acoustic power, resulting in devastating, soul-shaking decibel output that commands total highway respect.
MAXIMUM FLOW VOLUME AND DYNAMIC INTENSITY
The Ultra BlastMaster™ system replaces your restrictive baseline air delivery layout to open the performance floodgates, delivering a shocking twist on a classic setup. By transitioning your principal tank supply line to a massive 1/2" high-pressure feed run, this kit completely ditches standard restrictive lines. This massive jump in cubic feet per minute (CFM) allows the drivers to hit peak operational volume immediately, transforming your system into a deeper, noticeably louder, and far more aggressive train horn layout. When it comes to the ultimate vehicle configuration, "too loud" is just right.
THE VERDICT: The absolute peak of train horn intensity. The Model 6890 re-engineers your existing Demon™ setup into a multi-valve powerhouse, delivering the massive airflow scaling and instantaneous burst speeds required to rule the streets.
This specialized performance upgrade kit is engineered specifically for the Model 730 Demon™ Train Horn architecture. (For systems running the Model 230 Beast™ horns, please utilize BlastMaster™ Upgrade Model 6885).
Model 6890 is the official upgrade for the following Kleinn systems:
🔴 PRO TIP: Balance your upgraded pneumatic speed with clean electrical power distribution. Because you are now firing three high-performance solenoids simultaneously, protect your circuit pathways by routing your trigger lines through an isolated 40-amp fully sealed automotive relay like our Kleinn Part #340 to completely shield your cockpit activation buttons from electrical spikes.
PRODUCT SPECIFICATIONS
| Feature | Details |
|---|---|
| Part Number | 6890 |
| Product Collection | Ultra BlastMaster™ Maximum Flow Upgrade Pack |
| Solenoid Inclusions | Two (2) Vortex™ 6 VX6003 All-Brass 12V Valves |
| Primary Feed Line Size | Upgraded 1/2" Outside Diameter (O.D.) High-Pressure Line Run |
| Target Horn Compatibility | Kleinn Model 730 Demon™ Train Horn Assemblies exclusively |
| System Voltage Integration | Standard 12-Volt DC Control Loops |
Operating a triple-solenoid setup requires structured electrical distribution to safeguard your dash switches and ensure uniform current deployment to all coils simultaneously:
MANUFACTURER INSTRUCTION LINKS

$199.95
Kleinn Automotive Accessories stands behind the quality and craftsmanship of our products. Our products are covered against defects in materials and workmanship when properly installed and used under normal operating conditions, subject to the terms below.
Unless otherwise specified, Kleinn Automotive Accessories products are covered by a 1-year limited warranty from the original date of purchase.
This warranty applies to the original purchaser and covers defects in materials and workmanship under normal use.
If a product is determined to have a covered warranty defect, Kleinn Automotive Accessories will, at its discretion, repair or replace the defective product or component.
This warranty does not cover damage or failure resulting from:
Kleinn Automotive Accessories is not responsible for installation or removal charges, diagnostic fees, labor costs, vehicle downtime, loss of use, or other incidental or consequential expenses associated with warranty service.
To request warranty service, email warranty@kleinn.com with the following information:
A Kleinn representative will review your claim and may first attempt to resolve the issue through technical support.
If the product needs to be returned for inspection, Kleinn will provide a Return Authorization (RA) number and return instructions. Products should not be returned without prior authorization.
Once received, the product will be inspected to determine whether the issue is covered under warranty. If a covered defect in materials or workmanship is confirmed, Kleinn will, at its discretion, repair or replace the defective product or component.
If inspection determines that the product does not have a covered warranty defect, the product may be returned to the customer, and the customer will be responsible for applicable return shipping costs.
This limited warranty gives you specific legal rights. You may also have other rights, which vary from state to state.
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.
Merchandise that has been worn, used, or altered will not be accepted for return or exchange.
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.