temporary

Hi, Does anybody on this forum have any methods to temporary silence the exhausts while doing work on the vmax? The reason i need to do this is because my neighbors kinda hate my loud exhausts, and i want to be able to sync my carbs without driving out of the hood :P Would something like...

well it's happened a couple of times now, so I'm wondering if this is a common failure: after 20-25 miles of highway riding, I hit my rear brake and nothing happened. Pedal went all the way down as if there was no fluid left. When I got home I checked it, and it was working again ?!? So I...