Ok who is running this horn. Kleinn HK9. They are brand new and with the extra booster they are just retarded loud. I am getting them at wholesale price so I am not worried about getting stuck with them if I do not like them. Anyway, one of the guys at Kleinn told me that he just took off the K5s that he had on his truck because there is no reason to have all the weight when this kit will produce just as much sound. I doubled checked what he is saying on another board that I know he is apart of and sure as hell he has the set up for sale with the same reason for sale.