OK so I'm a bit over the inefficiency of the sc12 supercharger, and want to go turbo. I have got a T25 and can get a turbo manifold for ~$200 from the US, but inlet manifolds are a bit more tricky. It's currently suck through, and I think it would be pretty easy to put the throttle body in front of the turbo and use the standard manifold.
Intercooling wont be a problem because it wont have petrol through it, but what I want to know is do turbo's leak oil because of the petrol, or the vacuum when the throttle is closed? ie. will I need carbon seals even though theres no petrol going through the turbo?

You can see there's plenty of room on the exhaust side, and if I use a supra/soarer intercooler with the outlets on the same side piping shouldnt be too bad.