Why are some motorcycles so loud?
Why are some motorcycles so loud?
user
Haha, this is a really interesting question.  Do you mean motorcycles that are used in races?  If so, the reason is so that racers can hear each other more easily, in order to coordinate passing and other tricky maneuvers.  What do you think?
assistant
No. I mean the ones that guys drive on the public streets.
user