John P. just leveled up his 2017 GMC Sierra 2500. He installed the Conductor's Special 844 Nightmare Edition Train Horn Kit with the Shocker XL Train Horn Mount and a 220 PSI Digital Air Pressure Gauge, and now his truck is sounding louder, meaner, and ready to turn heads everywhere. From city streets to open highways, John's setup delivers power and precision—this Sierra is not just a truck, it's a statement.
The Conductor's Special 844 Nightmare Edition is a complete train horn system built around Shocker XL train horns and an 8-gallon 8-port steel air tank, paired with dual 1NM stealth black air compressors for serious performance. The kit operates at 150 PSI with automatic restart at 110 PSI, delivering extended honk time and fast refill rates that make it perfect for heavy-duty trucks like John's Sierra 2500.
John paired the kit with the Shocker XL Train Horn Mount for a clean, organized installation, and added a 220 PSI Digital Air Pressure Gauge for precise pressure monitoring. With dual compressors and an 8-gallon tank, this setup delivers extended honk time and rapid recovery, making it ready for both street use and show applications where performance and reliability matter.
Big congratulations to John for taking his 2017 GMC Sierra 2500 to the next level. His build combines the power of the Conductor's Special 844 Nightmare Edition with smart mounting and monitoring upgrades, creating a complete train horn system that delivers both sound and precision. From city streets to open highways, this Sierra is ready to make a statement wherever it goes.
Feature Highlights
- Conductor's Special 844 Nightmare Edition Train Horn Kit includes Shocker XL train horns, 8-gallon 8-port steel air tank, and dual 1NM stealth black air compressors
- Dual compressor setup provides faster fill times and extended duty cycle, operating at 150 PSI with 110 PSI restart pressure for reliable performance
- Paired with the Shocker XL Train Horn Mount for clean, organized installation and proper horn positioning
- Includes 220 PSI Digital Air Pressure Gauge for precise pressure monitoring and system status at a glance
- Complete kit includes pressure switch with relay, remote mountable intake filter, D.O.T. approved air lines, wiring, fittings, mounting hardware, and detailed instructions
NIGHTMARE EDITION POWER FOR YOUR SIERRA 2500
The Conductor's Special 844 Nightmare Edition Train Horn Kit gives your 2017 GMC Sierra 2500 the same power and precision that John unlocked on his truck. Built around Shocker XL horns, an 8-gallon air tank, and dual compressors, it delivers extended honk time and fast recovery for serious performance. Pair it with the Shocker XL Train Horn Mount and a 220 PSI Digital Air Pressure Gauge for a complete setup that's ready to make a statement on city streets and open highways.