even with turbo at around 7 or 8 psi u cant get more then 100hp or say 110 from it...stll NA g15 will out run it
choice is yrs....turbo, super charger and nos things are easy to say but cost alot and needs alot of maintenance and on this engine ...engine failure has more chances as internals are not strong
still with NA...get 2 inch piping along with headers..intake and plugs and wires will do help u gain extra 15hp
ECU chipping will cost you alot...