It's your right wheel bearing. If you can, replace both. My rear bearings went at the same time.

 

most defenetly a barring. I had the same noise. I was able to drive without a problem for some time. Not so for a friend of mine, she only had a few days before the berrings just disintegrated. I hope this never happens to me , it was the most horrable sound. Though the berring was in the front.

 

Years ago, I owned a Camaro [:'(] that did the exact some thing, only roared more on the right. It was the wheel bearings....

 

I agree with BaconBait. It should be the right rear wheel bearing. When making a left turn weight gets transfered to the right side. Just replace the right one. It should cost about $250 with labor.