Check your motor mounts. When those go bad the car is almost undrivable due to the noise (personal experience). If that's the case, then you should be good to go. Changing all three mounts should be no more than a 2 hour job.
Can't imagine the mounts needing replacement with only 22K mi on the car. Plus in my experience when mounts go bad, you hear vibration at idle too.
Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.