I'll bet my SVT (well, not really ) that it is the right wheel bearing. You see, the reason you hear it when you are turning left is that there is more weight and therefore more pressure being put on that particular wheel. I bet you hear almost nothing when you turn right and hear little noise when travelling straight. Not a biggie, just take care of it ASAP or more zhit can go wrong... BTW, had both of my front bearings replaced within 3k miles of each other... Same symptoms too.