As i said in the pm, the supercharger is just a modefied version of the m62 supercharger off the mini cooper s.
If your willing to deal with the hassles of converting it then you could save a decent amount of money.
If not then the kit is relatively inexpensive, especially with the euro to dollar conversion at the moment.
Speaking of which, i think i might buy myself some performance friction 2 piece disks when im in San Francisco next month, might make a nice upgrade