I have the same setup using both the horns, one for highway driving and other for city driving, i installed the 11 tone horn which comes with a chip, you can press 3 times continuously and switch to a different tone. its giving good service been 6 months now. Before that i was using Stebel in my car which lasted 3 years, one of the horns stopped working due to idiotic washing by service center, and the water damaged the horn even though i had it covered with plastic and tied up before i gave the car in and had told them to be careful.