I checked out my buddy's vacuum setup this morning and we're going to try something similar on the GT500. Pretty simple setup....the pump runs on 12v switched, produces about 6in of vacuum, will be trunk mounted, and the hose routing is very simple. We'll get to it in the next few weeks and I'll post pics of the installation. It should be easily replicable by anyone else who wants to give it a shot.
Would like to know the details. I have empty space where the stock ic tank was that I could mount a tank instead of running it back to the trunk.