I am getting a loud Whining noise from the back of my 1997 Acura RL. I thought it was the tires. I changed them to Yokahamas but the Noise is still quite loud. It seems to get louder the faster you go. (It sounds almost like an airplane taking off a (a loud Whine) The tires and rims are factory spec. Car has 103,115 miles on it. Could this be Rear Wheel Bearings?

Exactly. Change the bearings.

Good luck.

Hi yes this does sound like the rear wheel bearings are worn and need replacing, you can find this out by jacking either side rear wheels up one at a time, then spin the wheel, if it sounds graunchy that will be the wheel bearing you can also grab the top and the bottom of the wheel and push & pull top and bottom and if you get movement then that will also be the bearing's ....hope this helps

Yes, most likely. They are quite cheap and not so hard to replace. Check YouTube for tutorials on how to go about it.