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Warranty
Both the M3 non-weather-resistant kit and the 127H weather-resistant kit are backed by a 2-year manufacturer's defect warranty.
HornBlasters · Mini Outlaw
Mini Outlaw Train Horn Kit
Air System
HORN FINISH
Kit it out (optional add-ons)
+$39.99
+$42.89
+$189.99
+$66.60
2-year warranty
30-day money back
Everything included
Big sound. Small footprint.
The Mini Outlaw keeps the 3-chime metal train horn tone the full-size Outlaw is known for, then shrinks it to fit builds where space is tight. Real metal horns and the onboard air system to run them, all in one complete kit.
16.5″horn length
14.5″width
11″height
Big sound, honest hardware
Real train horn tone
A 3-chime metal train horn tuned for the deep, layered locomotive sound the Outlaw is known for, in a shell that fits where the full-size kit will not.
Compact onboard air
A complete onboard air source, compressor and tank both, in a footprint built for tight installs. It makes its own air and refills between honks.
Ready to install
The electric air valve comes pre-installed and the air source ships pre-assembled. Everything else needed for the install is in the box.
Hear the Mini Outlaw
One recording of the Mini Outlaw 3-chime horn at full pressure. No editing.
Audio sampleMini Outlaw train horn
0:000:00
Phone speakers undersell it. Earplugs ship in the box for a reason.
Pick your air system
Same Mini Outlaw horn on both kits, weather resistant either way. The air system decides how long you can honk and whether the air source is sealed against the weather.
Best value
Non-Weather Resistant (2-3 Seconds of Honk Time)
Get loud fast
120 PSIoperating
2-3 shonk time
$369.99kit price
The M3 compressor and tank combo operates at 120 PSI, and the 3-liter tank provides 2 to 3 seconds of honk time. It refills from 90-120 PSI in about 35 seconds. The most affordable way to run the Mini Outlaw, backed by a 2-year warranty.
All seasons
Weather Resistant (4-5 Seconds of Honk Time)
Sealed air source, longer honk
120 PSIoperating
4-5 shonk time
$399.99kit price
The 127H air source operates at 120 PSI, and the 1.5-gallon 4-port tank provides 4 to 5 seconds of honk time. It refills from 90-120 PSI in about 35 seconds. The air source is sealed against the elements, for builds that live outdoors.
Two finishes, one horn
The finish is the only difference. Same 3-chime horn, same air system, same roar.
Everything in the box
Each kit ships complete and ready to install. The horn is the same; the air system and its plumbing are what change.
Non-Weather Resistant (2-3 Seconds of Honk Time)
- Mini Outlaw train horn (Chrome or Stealth Black)
- M3 3-liter compressor and tank combo
- Pre-installed 1/4″ electric air valve
- 12 ft of 1/4″ air line
- 22 ft of 10-gauge red and 18-gauge blue wire
- Inline fuse holder, toggle switch, relay, and all electrical terminals
- All fittings and mounting hardware
- Detailed instructions and earplugs
Weather Resistant (4-5 Seconds of Honk Time)
- Mini Outlaw train horn (Chrome or Stealth Black)
- HornBlasters 127H air source unit (1.5-gallon 4-port tank)
- Pre-installed 1/4″ electric air valve
- 12 ft of 1/4″ air line
- 22 ft of 10-gauge red and 18-gauge blue wire
- Inline fuse holder, toggle switch, relay, and all electrical terminals
- All fittings and mounting hardware
- Detailed instructions and earplugs
Full specifications
Non-Weather Resistant (2-3 Seconds of Honk Time)Part No. HK-MC3-M3 / HK-MC3B-M3
Horn
| Horn | Mini Outlaw train horn |
|---|---|
| Dimensions | 16.5″ L × 14.5″ W × 11″ H |
| Weight | 10.9 lb (4.95 kg) |
| Voltage | 12-Volt DC |
Air source
| Unit | M3 3-liter compressor and tank combo |
|---|---|
| Operating pressure | 120 PSI |
| Restart pressure | 90 PSI |
| Max amp draw | 18 A |
| Unit size | 16.535″ × 4.921″ × 7.086″ |
| Drain port | 1/8″ NPT |
Fill rate (13.8 V supply)
| 0 to 120 PSI | 2 min (±10 sec) |
|---|---|
| 90 to 120 PSI | 35 sec (±5 sec) |
Weather Resistant (4-5 Seconds of Honk Time)Part No. HK-MC3-127H / HK-MC3B-127H
Horn
| Horn | Mini Outlaw train horn |
|---|---|
| Dimensions | 16.5″ L × 14.5″ W × 11″ H |
| Weight | 10.9 lb (4.95 kg) |
| Voltage | 12-Volt DC |
Air source
| Unit | HornBlasters 127H air source |
|---|---|
| Air tank | 1.5-gallon (6.6 L), 4-port |
| Compressor | 2L, 18 A max, 25% duty @ 100 PSI |
| Operating pressure | 120 PSI |
| Restart pressure | 90 PSI |
| Unit size | 15.2″ × 5.9″ × 12.8″, 13.75 lb |
Fill rate (13.8 V supply)
| 0 to 120 PSI | 2 min 10 sec (±10 sec) |
|---|---|
| 90 to 120 PSI | 35 sec (±5 sec) |
What owners say
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More HornBlasters gear that pairs with the Mini Outlaw.
Before you buy
How long can I honk the horn?
It depends on the air system. The M3 non-weather-resistant kit gives you 2 to 3 seconds of honk; the 127H weather-resistant kit gives you 4 to 5 seconds. Both refill from 90-120 PSI in about 35 seconds, so you are never waiting long between honks.
Which air system should I get?
The horn itself is weather resistant on both kits, so this is only about the air source. The M3 kit is the best value and gets you loud fast. Step up to the 127H kit if your build lives outdoors: its air source is sealed against the elements, it gives you a longer 4 to 5 second honk, and it can also top off tires. Both carry the same 2-year warranty.
Will it fit my vehicle?
The horn needs a footprint of 16.5 inches by 14.5 inches and 11 inches of height, plus a spot for the compact air source unit. It runs on 12-volt DC, so trucks, SUVs, boats, and RVs are all fair game, and it is built for tighter installs than a full-size kit.
Can I air up tires with it?
Only with the Weather Resistant air system. That system runs a 1.5-gallon tank and can top off tires in addition to powering the horns, though it fills smaller volumes than our larger onboard-air systems. The Non-Weather Resistant 3-liter system powers the horns only.
What is the warranty?
Both kits are backed by a 2-year manufacturer's defect warranty. Both include our 30-day satisfaction replacement or refund guarantee. One caveat on both: detaching the compressor from the tank voids the warranty. If you need a split compressor and tank layout, go with the 232 and higher models.
Buy with confidence
Satisfaction guarantee
We offer a 30-day satisfaction replacement or refund guarantee on all purchases, except where otherwise noted in the product listing.
Money-back / refund policy
Merchandise may be returned within 30 days from the shipment arrival date for a refund. A Returned Merchandise Authorization (RMA) number is required for all returns, and a 15% restocking fee may apply. Please report any order discrepancy within 7 days of the invoice date.
Physical damage policy
Physical damage to any product voids warranty coverage. This includes improper handling and any damage sustained by irregular usage.
Mounting and compressor warranty note
Tank-mounted air compressors are not fully sealed. Mount the tank and compressor upright in an enclosed space away from moisture, dirt, and debris. Failure to mount this product as directed, or detaching the compressor from the tank, voids the warranty. If you need a solution where the compressor is detached from the tank, look at our 232 and higher models.
California Proposition 65 Warning
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
Hearing protection recommended
These air horns are extremely loud. Wear hearing protection when testing at close range, never honk directly next to a person or inside an enclosed space, know your local regulations, and use the horns responsibly.
Announce every arrival.
The Mini Outlaw Train Horn Kit ships complete, installs with hand tools, and packs the Outlaw tone into a footprint made for tight spaces.