I'll have to check again. Unfortunately I have an auto. I think I was going like 5mph now that I think about it. I'll have to check when I'm at idle in Drive. I have 2 other humming noises I have to check to make sure it's not the turbos. 1. My antenna is bad (getting it replaced). So when you go, it sounds like turbos! My dad had that happen on his n/a :) 2. My stereo (Sony eXplod) does some weird spinning noises.
I will check again. If they are spinning at idle in Drive, what does that mean?