Well a NA engine to turbo engine will ALWAYS require a new exhaust manifold that the turbo will bolt to, as its exhaust gases that spin the turbo.
You'll also need to get an intercooler for anything other than very very low boost and tbh I'd have one no matter what, even though it creates more lag. I'd not feel safe. Fuelling will need to be changed too, i.e better injectors and a custom fuelling map as well as Ignition map.