In all honesty, and at the risk of being shot down in flames, there are a lot of good reasons why you shouldn't go FI with a Z. If you're looking for big power (particularly down the turbocharged route) it would make a lot more sense, both financially and in terms of reliability, to go for a car that was leaves the factory with that kind of kit installed and upgrade as needed from there. If the Z isn't quick enough for you, buy a quicker car!
That said...
I have a Vortech kit on order and will be installing it in the new year. I appreciate the above and fully expect to run into problems along the way, however half the fun for me is the project itself, as well as the ongoing maintenance required.
If that doesn't put you off I would say go for it - but bear in mind there may well be dramas and that chasing big numbers will soon run up massive bills and may well leave you wondering why you didn't buy a faster car from the off.
Just my 2 cents!