My 2008 Lexus is250 almost makes a whirring sound only when i’m driving it, not when i rev it in park. I’ve ruled out the transmission as it’s in good condition and i can hear my engine behind the sound so i don’t think it’s directly connected to the engine. It gets louder as i go faster and gets quieter as i get slower. And it can mostly only be heard from the passenger seat but passengers have heard it when going highway speeds (because it gets louder at higher speeds) any ideas what it may be? sound is a bit hard to hear in the audio, but any suggestions would be appreciated!!