the bolt on super charger kits are available but hard to find, they aint cheap either
But as brad says you will need some serious engine work upgrading to get the engine to be able to handle it
I think there was a post about this ages ago and the concensus was if you want a turbo fit a turbo engine - this will cost £Â£Ã‚£s as well though
There was a guy on here who said he was going to turbo his 8 or 16V engine but AFAIK he hasnt updated about it