Jagjit outfitted his 2021 GMC Sierra 1500 AT4 with a Conductor’s Special 244K Nightmare Edition train horn system to deliver powerful, authentic locomotive-style sound with clean mounting and utility beyond just horn performance. This setup turns the AT4 into an attention-commanding truck with both sound and practical onboard air capability.
What Train Horn System Was Installed on This 2021 GMC Sierra 1500 AT4?
Jagjit’s Sierra was equipped with the Conductor’s Special 244K Nightmare Edition train horn kit, featuring legendary Shocker XL train horns and a robust HornAir 244K air system.
Key installed components:
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Shocker XL Train Horns – Hand-tuned for authentic train sound
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HornAir 244K Air System – 2-gallon tank and powerful compressor for 5–7 seconds of honk time
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Spare Tire Delete Bracket – Clean underbody install that fits in the factory spare location
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Nightmare Edition Finish – Blacked-out hardware for a stealthy, aggressive look
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Utility Beyond Sound – Onboard air system can inflate tires or power small air tools
How Does This Train Horn System Perform?
The Conductor’s Special 244K system delivers 5–7 seconds of honk time per activation and refills quickly thanks to the efficient onboard air system. The Shocker XL horns are hand-tuned for powerful, authentic train-style sound audio.
System highlights:
- 150 PSI maximum operating pressure
- 110 PSI automatic restart pressure
- Onboard air system usable for inflating tires and powering small air tools
- Stealthy Nightmare Edition styling to match rugged truck builds
Why This Setup Works Well on a Sierra 1500 AT4
The GMC Sierra 1500 AT4 provides plenty of space under the truck for a clean train horn installation, especially using a Spare Tire Delete bracket to utilize otherwise unused area. The result is both dramatic sound and a functional onboard air system without interfering with vehicle geometry.
Benefits for this vehicle include:
- Dramatically louder sound compared to stock horn
- Clean, hidden installation underbody
- Onboard air available for tire inflation or tools
- Visual enhancement with the blacked-out hardware look