ok ever since i bought my car it had a wierd howling from the back wheels, only when they are turning though. so when i upgraded to 17's i got an alignment, now it still does the howling but not as loud, i was thinking bad bearings, anyone else have this???

Thats what mine did before they were replaced.

My guess is your wheel bearings too.

Does the sound change as you speed up/slow down?

could be rear hubs. check your tire for play, my buddy mike had a bad hub in the back and could move his tire back and forth like the lugs werent tightend all the way down. hed get the noise when he was going straight, but when he turned, it went away.