When I accelerate quickly in first and second gear I hear a vibration that sounds like it's right under the center console. I think It might be the bushing thing that connects the front part of the drive shaft to the back part. I want to know what's wrong and what would be the easiest fix.

The two most likely causes are a worn front universal joint - a relatively easy fix but probably fairly expensive if done by BMW- or more serious, but lees likely, a worn bushing in the transmission tail-shaft housing. The latter will be more difficult and costly to repair but doesn't happen very often. A worn universal joint is much more likely. Dr.J