I recently installed 4.10's into my M6 and the whine is unbearable. I have NO catback and my exhaust is turned down after the Y-pipe...and I can still hear it through 3rd and 4th and gets to the point where I dont even want to put it into 5th and 6th just because I hear the whine and not the car.

Anything I can do to help the noise ? Ive seen Lucas Gear Oil which is like 140W.. anyone else run this? Did it help? I might just end up going to another shop to get it re-checked...

go back to whoever installed them, not a new shop, they probably didn't set them up right. Richmonds tend to whine a little more then other brands but nothing really noticeable or unbearable. Definitely take it back to whoever installed them