No sign of feathering or uneven wear. When I first got the car, it had about 10k on it and was quiet. This sound is very annoying. It's not an even hummmmmmmmmmmmm, it's an uneven, wom, wom, wom, wom, wom, wom, wom......... (say that outloud fast, and that's what it sounds like). Yes, the tires are the original PS2 Michelins.

I'm a mechanical guy, but I can't fix what I can't find. Thanks for the help, I'll keep checking. No way am I taking it to a dealer though.