As far as the PM Bullet Skimmer goes, I believe it is the Beckett that makes the horrible sucking sound, but I've never heard of a muffler for it. That may be why the ones at Fish Place were so loud, who knows. I've got experience with the AquaC EV's, so better safe than sorry.
Just an FYI - I took the time to call around to EVERYONE, and no one carrys them locally... Looks like I'll be ordering it from one of our online sponsors.