Supercharger/Turbocharger for Infiniti Q45?

Ok I have a few more questions related to cars. Is there and existing turbo/supercharger for a V8 Infiniti Q45 year 1997? Is it worth getting one for it? Will performance be increased? Will gas mileage increase? How much would a super/turbocharger cost? Is it possible to install at home or do I need to do it in a shop?





Thanks in advanced guys, you answered my last question about the blowoff valve magnificently