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Exterior three-quarter view of John's 2017 GMC Sierra 2500 with HornBlasters Conductor's Special 844 Nightmare Edition train horn kit featured customer install gallery photo 1
Side profile of 2017 GMC Sierra 2500 with Conductor's Special 844 Nightmare Edition train horn kit install HornBlasters gallery photo 2
Front angle of John's 2017 GMC Sierra 2500 with Conductor's Special 844 train horn kit HornBlasters gallery photo 3
Close-up of Conductor's Special 844 Nightmare Edition train horn bells on GMC Sierra HornBlasters gallery photo 4
Compressor and air system detail for Conductor's Special 844 on Sierra 2500 HornBlasters gallery photo 5
Under-hood or mounting detail for Conductor's Special 844 Nightmare Edition train horn kit HornBlasters gallery photo 6
Wide shot of finished Conductor's Special 844 Nightmare Edition train horn kit install on John's 2017 GMC Sierra 2500 HornBlasters gallery photo 7
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Exterior three-quarter view of John's 2017 GMC Sierra 2500 with HornBlasters Conductor's Special 844 Nightmare Edition train horn kit featured customer install gallery photo 101
Exterior three-quarter view of John's 2017 GMC Sierra 2500 with HornBlasters Conductor's Special 844 Nightmare Edition train horn kit featured customer install gallery photo 102
Side profile of 2017 GMC Sierra 2500 with Conductor's Special 844 Nightmare Edition train horn kit install HornBlasters gallery photo 203
Front angle of John's 2017 GMC Sierra 2500 with Conductor's Special 844 train horn kit HornBlasters gallery photo 304
Close-up of Conductor's Special 844 Nightmare Edition train horn bells on GMC Sierra HornBlasters gallery photo 405
Compressor and air system detail for Conductor's Special 844 on Sierra 2500 HornBlasters gallery photo 506
Under-hood or mounting detail for Conductor's Special 844 Nightmare Edition train horn kit HornBlasters gallery photo 607
Wide shot of finished Conductor's Special 844 Nightmare Edition train horn kit install on John's 2017 GMC Sierra 2500 HornBlasters gallery photo 708
Featured Install

Conductor's Special 844 Nightmare Edition Train Horn Kit

John's 2017 GMC Sierra 2500

Sound Sample
0:00 0:00
Owner John
Year 2017
Vehicle 2017 GMC Sierra 2500

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
HornBlasters Shocker S6 544K Nightmare Edition Train Horn Kit

PRODUCT

PRICE

Sold out
HornBlasters Shocker S6 544K Nightmare Edition Train Horn Kit

Sold out

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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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.

SPECIFICATIONS

Part Number HK-S4-844K
Operating Pressure 150 PSI
Restart Pressure 110 PSI
Voltage 12-Volt DC
Horn Shocker XL train horn
Horn Material High-impact fiberglass reinforced ABS
Horn Measurements № 1 19.50″ (495.30 mm)
№ 2 16.25″ (412.75 mm)
№ 3 14.75″ (374.65 mm)
№ 4 12.75″ (323.85 mm)
Horn Flare 6.5″ (165.1 mm)
Air Tank HornAir 8-gallon 8 port air tank
Tank Length 32.5″ (825.5 mm)
Tank Diameter 10.5″ (266.7 mm)
Tank Height 12.5″ (317.5 mm) (With Legs)
Tank Weight 32 lb (14.51 Kg)
Max amperage 25 Amps
Maximum duty cycle 100% @ 100 PSI / 50% @ 200 PSI
Flow Rate @ 0 PSI 1.75 CFM
Maximum working pressure 200 PSI
Compressor length 10.75″ (273.05 mm)
Compressor width 4″ (101.6 mm)
Compressor height 6.75″ (171.45 mm)

Frequently Asked Questions

The Conductor's Special 844 Nightmare Edition Train Horn Kit includes Shocker XL train horns, an 8-gallon 8-port steel air tank, dual 1NM stealth black air compressors, 110/150 PSI pressure switch with 40 amp relay, remote mountable intake filter assembly, spare air filter elements, D.O.T. approved air lines, complete wiring kit with fuse holder and fuses, brass NPT fittings kit including safety blowoff and drain cock, compressor mounting hardware, detailed instructions, air line cutter, and earplugs.

The dual 1NM compressor setup in the Conductor's Special 844 Nightmare Edition provides faster fill times and extended duty cycle compared to single-compressor systems. With two compressors working together, John's Sierra 2500 gets quicker recovery from 110 to 150 PSI and more reliable performance during extended use, making it ideal for both street driving and show applications where consistent air pressure matters.

The Shocker XL Train Horn Mount provides a clean, organized mounting solution for the Shocker XL horns, ensuring proper positioning and protection. The 220 PSI Digital Air Pressure Gauge gives John precise pressure monitoring at a glance, allowing him to track system status and ensure optimal performance. Together, these upgrades enhance both the installation quality and operational awareness of the train horn system.

With an 8-gallon tank operating at 150 PSI, the Conductor's Special 844 Nightmare Edition provides extended honk time compared to smaller systems. The dual compressor setup also ensures faster refill rates from 110 to 150 PSI, giving John quick recovery between blasts. While exact honk time varies with usage patterns, the 8-gallon capacity and dual compressors make this system ideal for extended use on city streets and open highways where consistent performance matters.

The Conductor's Special 844 Nightmare Edition runs on 12-Volt DC power with dual compressors that each draw up to 25 amps maximum. The kit includes the wiring, relay, and fusing needed, but your truck's charging system should be in good condition to handle the combined compressor load. Heavy-duty trucks like the 2017 GMC Sierra 2500 typically have robust electrical systems that can support this type of dual-compressor onboard air system without issues.


SHARE YOUR HORNBLASTERS SETUP

Have a Conductor's Special 844 Nightmare Edition or another HornBlasters setup on your truck? We'd love to see it. Submit photos and details of your setup for a chance to be featured in our install gallery and help other Sierra owners plan their own train horn upgrade.

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John's 2017 GMC Sierra 2500 Train Horn Install | Conductor's Special 844 Nightmare Edition