ive been told by a few tuners here in WA that if flowing a cyl head or porting it wont make much difference if your going to go FI as opposed as staying NA.
i was gona get my cyl head flowed and get a edelbrock manifold but it make f all difference once i boost, this is looking at the cost of flowing and manifold wich is well over 2gs including all labour as opposed to getting and fitting at turbo kit which i can get for under 4500 and fitting is only bout 1000.
i think that is way better bang for buck than ripping you engine open and shaving off 1 gram off Aluminium