Haven't noticed any more vibration. And the sound is exquisite! It's louder, I'm tempted to say a lot louder, but that doesn't tell the whole story. The sound is a lot deeper, throatier, I'm running out of adjectives.
They sound bitchin'. That's about as close as I can get to describing the sound.
I have had some popping during deceleration, so I'll be disabling the PAIR valve.