When should I get my turbo?

Hi I'm definately going to be turboing my b16a2 in the near future but I don't know what order to get the parts in...

I WAS going to get a full 3inch bore exhaust system installled, then get the turbo but set the boost to practically nothing, then start building up the internals and turn up the boost as I go along.

But would using an exhaust like that on my n/a engine give me a sever loss in power? That's the message i seem to be getting at the moment...

Basically my question is: Can I install a turbo on my current engine and leave the boost VERY low and not do any damage? I wouldn't lose power would I? Not sure which turbo I want yet but it needs to be big as I'm aiming for 300hp in the long run so would I be able to install it and then start building up the engine/fuel/ignition/exhaust when I can afford it?