[Powerfiend]

Roughrider, I've got the same sound. I took it to the dealership and they couldn't figure it out. I was able to localize it to something related to the throttle body. I took the air filter out and put it back after blowing it off and the pitch of sound changed. I have about 12k miles on my 06' and it just started about a month ago. If the windows are down its more noticeable right around 2-2500 rpm.