I've got a 2000 Stang GT. I've just replaced the tires with BF Goodrich G-force T/A KDWS. I noticed that my car now produces a rather loud hum at 30+ mph. So loud that it is difficult to hear the beautiful music coming out of my exhaust pipes. I was wondering if this could be due to the tires cupping. What is a sure way to check for that sort of thing?