Standard internals will take 300bhp but above this look at having the bottom end strengthened.

I'd go k03s hybrid injectors sports cat (if staying road legal) if not de-cat and free flow exh.
CAI front mount and re-map. Be knocking on the door of 300bhp with that lot. But I'd also look at dumping the dual mass flywheel and go for the G60 flywheel with uprated VR6 clutch.