annoying noise

I just bought a used 2003 3.2tl and im hearing this annoying noise while im driving. I hear it the most at 80kmh. When i turn left you hear it less and when i turn right it makes no difference. I thought it was the left wheel bearing so i got it changed but its still there. It also does not make a difference when i put the car in neutral while driving i even rotated and balanced the tires the tires but its still there. Any help would be greatly appreciated.