As for the vibration, it is most likely caused by the > dreaded passenger side mount. Version: 7.0.344 / Virus Database: > 267.11.9/118 - Release Date: 10/3/2005 Some rear mounts do not have a corner clearanced and will touch the steering rack. This will result in moderate-to-severe vibration felt throughout the car. Solution: new mount or hacksaw. Larry sandiego16v