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Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install
Blake's 2005 GMC Sierra 1500 Z71 Train Horn Install

2005 GMC Sierra 1500 Z71

Flatlaw 127H Train Horn Kit

SOUND SAMPLE:

EXPAND GALLERY
CONTINUE TO INSTALLATION →

Blake C. took his 2005 GMC Sierra 1500 Z71 to a whole new level with the addition of our Flatlaw 127H Train Horn Kit, a bold move that paid off with seriously head-turning results. Designed for those who want big sound in a sleek form factor, the Flatlaw 127H kit delivers everything from a deep, commanding rumble to a ground-shaking blast.

This install perfectly showcases how even older model trucks can be outfitted with cutting-edge horn kits for show-stopping sound and performance. With a clean setup and attention to detail, Blake’s Sierra now demands respect on every road it touches.


Key Features

  • Flatlaw 127H complete train horn kit with flat-design horn
  • 1.5-gallon 4-port air tank for adequate air storage
  • 2L compressor with 18-amp maximum draw
  • 120 PSI operating pressure with 90 PSI restart
  • Compact 8" height design for tight installations
  • 25% duty cycle @ 100 PSI for reliable operation

EXPERIENCE FLAT-DESIGN TRAIN HORN POWER LIKE BLAKE

Transform your Sierra with the innovative Flatlaw 127H. Get the same compact, powerful train horn system that delivers maximum sound in minimal space.

UP TO 1500% LOUDER

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UNLIMITED HONKING

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ZERO
DELAY

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CAPABLE ONBOARD AIR SYSTEM

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HornBlasters Shocker S6 544K Nightmare Edition Train Horn Kit

PRODUCT

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HornBlasters Shocker S6 544K Nightmare Edition Train Horn Kit

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SPECIFICATIONS

Part Number HK-F3B-127H
Operating Pressure 120 PSI
Restart Pressure 90 PSI
Voltage 12-Volt DC
Horn HornBlasters Flatlaw Train Horn
Horn Length 17.5" (444.5 mm)
Horn Width 16.25" (412.75 mm)
Horn Height 8" (203.2 mm)
Horn Weight 12.5lbs (5.67 kg)
Air Source Length 15.2″ (386.08 mm)
Air Source Width 5.9″ (149.86 mm)
Air Source Height 12.8″ (325.12 mm)
Air Source Weight 13.75 lb (6.24 Kg)
Air Tank 1.5-gallon 4 port air tank
Volume 1.5 gal (6.6 L)
Air Compressor 2L air compressor
Max Amperage 18 amps
Maximum Duty Cycle 25% @ 100 PSI

FILL RATES

1.5 GALLON TANK FILL RATE
0 to 120 PSI 2 min. 10 sec. (±10 Sec.)
90 to 120 PSI 35 sec. (± 5 Sec.)

Test Your Train Horn Knowledge

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Quiz Complete!

Train Horn FAQ

The Flatlaw 127H is a complete train horn kit featuring a flat-design horn with integrated air system, perfect for installations with height restrictions.

The system operates at 120 PSI maximum working pressure and automatically restarts at 90 PSI, providing consistent performance for train horn operation.

The kit includes a 1.5-gallon, 4-port air tank that provides adequate air storage for the flat-design horn system.

The kit includes a 2L compressor with 18 amps maximum draw and a maximum duty cycle of 25% @ 100 PSI, designed for the flat horn system.

The horn measures 17.5" length x 16.25" width x 8" height and weighs 12.5 lbs, making it ideal for installations with height restrictions.


Share Your Build
Drop your install pics below if you’re rocking the Flatlaw — we wanna see ‘em! Click the button below to submit your install photos to our media submission form!

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Flatlaw 127H Train Horn Kit on 2005 GMC Sierra 1500 Z71 | Hornblasters