I'm trying to get a 6-8 PSI Supercharger fitted to my EF futura 6cyl which runs on LPG most of the time. Where is the best place around Brisbane or Gold Coast to see. my price range is around $5000. Any other input is greatly appreciated.

I reckon you'll struggle to get one fitted for $5,000. It'd cost about that for a DIY kit from CAPA which you'd have to set up yourself.