2011 Ford F-150 Flatlaw train horn grille install
2011 Ford F-150 Flatlaw train horn grille install
2011 Ford F-150 Flatlaw train horn grille install
2011 Ford F-150 Flatlaw train horn grille install
Progress
2011 Ford F-150 Flatlaw train horn grille install 01
2011 Ford F-150 Flatlaw train horn grille install 02
2011 Ford F-150 Flatlaw train horn grille install 03
2011 Ford F-150 Flatlaw train horn grille install 04
Featured Install

Flatlaw Train
Horn Kit

2011 FORD F150

Sound Sample
0:00 0:00
Owner David
Year 2011
Vehicle Ford F150

Fred gave his 2016 Jeep Cherokee a serious sound upgrade with the Sniper

David E. took his 2011 Ford F-150 to the next level with the HornBlasters Flatlaw Train Horn Kit, turning an already solid truck into something that demands attention on and off the road. The Flatlaw Train Horn Kit is known for its aggressive tone and compact design, which makes it a strong match for builds that need serious sound without sacrificing space.

For this setup, David installed the Flatlaw Train Horn Kit right behind the front grille, giving it a strategic mounting position. That placement lets the sound project forward more directly, maximizing volume and presence while keeping the install clean and integrated with the truck’s front end.

The result is a loud, deep train horn blast that cuts through traffic and makes an impression. HornBlasters positions the Flatlaw train horn as a flat, space-saving take on the classic Outlaw attitude, bundled on the kit page with a complete 120 PSI onboard air system and the wiring, valve, line, and hardware you need to finish the job. Clean install, strong performance, unmistakable sound—this 2011 F-150 is now impossible to ignore.

If you are still choosing a package, compare variants and add-ons on the Flatlaw Train Horn Kit listing, or use HornBlasters’ horn kit recommendation tool when you want a second opinion on cab, grille, and bed constraints.

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

UP TO 1500% LOUDER

HornBlasters logo

UNLIMITED HONKING

HornBlasters logo

ZERO
DELAY

HornBlasters logo

CAPABLE ONBOARD AIR SYSTEM

HornBlasters logo

Feature Highlights

  • Flatlaw Train Horn Kit pairs the Flatlaw horn with a HornBlasters 120 PSI air system—compact footprint with train horn presence
  • This F-150 install: behind the grille so tone fires forward and stays visually tidy from the curb
  • HornBlasters bills the Flatlaw as Outlaw-inspired sound in a flat layout built for tight engine-bay and front-end real estate
  • Kit page offers non–weather-resistant and weather-resistant air system choices with different honk windows; confirm which bundle you need before checkout
  • Optional checkout add-ons on the listing include wireless remote, tire inflation, gauges, and extended warranty when your build needs more than the base kit

FLATLAW TRAIN HORN KIT FOR YOUR FORD F-150

The Flatlaw Train Horn Kit delivers the same aggressive, space-smart recipe David E. showcased on his 2011 Ford F-150—ideal when you want grille or core-support mounting without a full-size multi-bell stack. Review HornBlasters’ latest specs, variant differences, and mounting warnings on the product page, follow the PDF instructions for your selected air system, and plan wiring, fusing, and relay routing like any high-draw 12-volt accessory on an F-150.


SPECIFICATIONS

Part Number HK-F3B-M3
Horn 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)
Voltage 12-Volts DC
Air Source Kit 3-Liter air compressor & tank combo
Operating Pressure 120 PSI
Restart Pressure 90 PSI
Air Source Length 16.535" (420mm)
Air Source Width 4.921" (125mm)
Air Source Height 7.086" (180mm)

FILL RATES

3-LITER AIR TANKK FILL RATE
0 to 120 PSI 2 min. (± 10 sec.)
90 to 120 PSI 35 sec. (± 05 sec.)

Frequently Asked Questions

HornBlasters lists two primary configurations on the Flatlaw Train Horn Kit product page: HK-F3B-M3 with the 3-liter compressor-and-tank combo, and HK-F3B-127H with the weather-sealed 127H air source. David’s forum thread does not specify which variant he ordered—use the live storefront options and manuals to match your climate, honk-time goals, and packaging space.

David’s build proves it can work beautifully when you measure stack height, bracket loads, and cooling airflow around the radiator and active grille shutters (if equipped). Always secure the Flatlaw horn so it cannot contact moving parts or rub through wiring, and keep the bundled air system where HornBlasters’ instructions allow—especially upright mounting and moisture guidance called out for tank-mounted compressors.

HornBlasters documents both Flatlaw kit configurations at 120 PSI operating pressure with a 90 PSI restart setpoint on the Flatlaw Train Horn Kit listing. Honk duration and refill times differ between the 3-liter M3 bundle and the 127H weather kit, so read the spec tables on the product page before you buy.

HornBlasters markets the Flatlaw as the flat, tight-space evolution of the Outlaw family—same aggressive marketing story with a footprint tailored to grille pockets and crowded engine bays. If you need more bells or a larger onboard air system, step up through HornBlasters’ train horn collections or the horn kit recommendation wizard.

No. HornBlasters explicitly warns that separating the compressor from the tank on these kits voids the warranty. If you need a detached compressor layout, the brand directs shoppers toward 232-series and larger Conductor’s-style packages—see the warning block on the Flatlaw Train Horn Kit page for the exact language before you modify anything.


SHARE YOUR HORNBLASTERS SETUP

Running a Flatlaw, Outlaw, or another HornBlasters kit on your F-150 or half-ton Ford? We’d love to see it. Submit photos and details of your installation for a chance to be featured in our install gallery.