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.

