I have the Wolo 320-2T electric horn set. One thing that I noticed when installing is that the high tone horn is the exact same loudness and frequency as the stock horn. O i have three now =) stock, plus the wolo set. sounds nice, and ppl pay attention to it. I have considered going with air horns, but for an extra 4 decibles, I think I may pass. Dosen't seem enough of a difference to bother with.