Spring is in the noise

Today was one of those first real days of Spring when you can go outside, smell the fresh spring air, get your hands in the dirt, and .. hear open pipes on about fifty motorcycles.  Really, I'm sure it must be great to get a bike out of the garage.  I myself would be interested in trying out a bike.  But why is it that they have to be deafening loud?  I know they should be louder then cars so you know they're there, but when they sound like a jet engine coming down the road shaking the house it kinda unnerves me.  If my car did that I'd get a ticket...