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it depends on how internal you want to get. because you could get a stroker kit, or just bigger pistons, you could port and polish the head, different intake manifold, it all depends on how deep you want to get, hope that helps
if you arent wailing on the car, 18-23 on a gsr seems impossible. might be running kinda high on the timing, might be an ecu issue. Really got nothing from the information you've given.
do a turbo and tune it..that should be enough power forawhile
wanna keep the vehicle all moter no forced induction...
Well you already have a 11:1 compression ratio so I would say bigger cams.
But if you want to go all out you will need Higher domed pistons, maybe bored to 82mm, P&P the head, 1+mm valves, rocketmotorsports cams, and ITB's.
Needless to say 440cc injectors and a better fuel system.
Also before all of this I would say at least upgrade your breaks.