If you need to ask about turbo's then you don't realise how much work is actually envolved with fitting one. When fitting a turbo you'll need to consider:
Pipe route, inter cooler, boost level, if uprated internals are required, engine management, engine mapping, replacing the exhaust to something more suitable, upgrading the brakes, the oil feed and return to the turbo.
It doesn't sound like an awful lot, but believe me the amount of work is staggering and expensive if you dont know what you're doing!