Huge waste of money h:

I'm with 2gr84u... if you really want to get decent power from your z6, turbo is the only cost-effective way. Research, research, research... if you spend a lot of time searching through old threads, reading FAQ's and gathering information, you'll have a better grasp of the kind of work and parts required and you'll be able to make an educated decision. Don't buy a single part until you've got a complete plan laid out.