You shouldn't be upset. It was good that they left a note instead of taking this another route. I try to drive slowly since I know my car is louder than most, I also try to warm up my vehicle before pulling off. I can appreciate the sound of a nice audible exhaust on almost any vehicle...but unfortunately some people don't like it. That is just the way it is...fortunately or unfortunately I have a bunch of Honda owners flying up and down my street with some pretty horrible sounding exhaust systems, no tone, just loud...slow or fast. I think I am in the clear as long as they stay around lol. BTW that is not a slight towards Honda owners...I like all cars...but these things take the cake, pretty much thrown together cars, barely hanging on, being driven hard and trashed by their owners.