My cats and I feel your pain Kirsten!!! Not only do we have booming car stereos to deal with, we now have kids playing in a band almost every afternoon. Not a band with music but a hard rock band. I expect to see the devil himself prancing across my lawn every time they play. (and these kids are half a block away)

I called the police. Seems people can make as much noise as they want to here until 11 at night. Never mind it is so loud it rattles our windows and shakes our floors and keeps us from enjoying our own homes.

I took myself off and had a chat with the kids and asked if they would turn the volumn down. It helped for 5 minutes. They have been keeping practice times shorter though. Hopefully your kid will find something else to amuse himself and lose the horn thing soon.