I think topher may be right about the supercharger not fitting
In the US they didnt get an 8V MK3 (I think), I think they only got the 16V and VR6 - I wouldnt quote me on that but I remember readin it somewhere
Quoting from that bahnbrenner link above..
The complete bolt-on Stage I kit bumps up your power by nearly 60% 177+ bhp 180 Torque!
That has to be talking about the 8V engine... since the 16V already has 150BHP so that's a pretty piss-poor increase if they started with a 16V... People seem to get figures like that with a Chip, Filter and zorst on a 16V....
I'd love a supercharger kit for my VR though...

but it eats enough fuel as it is
