I have a neighbor that has added some boom to their ride. Most of the time, they are cool with it, but every now and then (mainly weekends) they come home with the tunes kickin. It's not a regular, so I attribute it to a night out having fun and forgot to turn it down vs I'm an inconsiderate asshole.

At the same time, I find the loud pipes save lives people to be much more annoying as they don't ever give a damn about what time it is or what kind of sleepy neighborhood they are currently riding.