I bought the HB4H horns and the Horn-Air kit with the 2 galllon tank way back in March and didn't get around to actually installing them on my Honda Civic till early June. After I got the install done I couldn't believe how loud those damn horns are. Words honestly can't explain the amount of noise these horns put out. I waited two years before i purchased the horns and I kick myself in the butt for waiting that long. Anyone who complains about these horns must of been born without a sense of humor. This was money well spent!