I did the muffler delete last week and can add a little insight. It was well worth the mod IF you are wanting to hear more beautiful TT V6 noise and can handle the drone. There is some vibration+drone exhaust noise for sure at lower RPM when cruising, but if on the freeway I pop it in eco mode and it's nothing too bad. I'm also a 33 year old guy, so I love car sounds.. doesn't bother me at all. Considering it cost me $150 to straight pipe both sides total, well worth it.
It IS worst for passengers in the rear though. One night I rode in back so wife and mother in law were in front and the vibration from the rear axle area was far worse than stock and the drone was even louder (obviously closer to exhaust exit).
One negative side effect is with stock mufflers nobody messed with me, now a bunch of cars want to try to race because it caught their attention.