I've always wondered this: When kurt transports, can anyone hear it or is it silent?

Anyone can hear it, but it's not that loud. It can be muffled if there is a louder sound present or people yelling. It also seems like he can control how loud it is.

BAMF ?

Yeah, the bamf sound is supposed to sound like the muted explosion that a circus magician or ninja might use as a sound and smoke effect. The X-2 movie did a good job of duplicating the entire effect.

thanks