2020-2025 Jeep Gladiator JT (4-Door Only) (Excludes Diesel, Hybrid, and aftermarket exhaust) Installation Instructions Add the Model JT220 Dual Train Horn to let them know you’re coming over the top. Kit includes a custom designed direct fit mounting bracket and model 220 dual train horn that produces an earth shaking 154.2 decibels. Kit is 100% bolt-on and requires no drilling. The JT220 is designed to work with the JT-OBA Gladiator Onboard Air System but will work with any onboard air system that does not interfere with the horn mounting location and has minimum 100 PSI and 1-gallon air tank.