Just want to get a rough idea of how hard it would be to get about 150hp out of my digi 8v.

I was thinkin later down the track, (more of a dream realy):
Chip
2L bottom end
Full exhaust
maybe port and polish da head with biger valves and different cam

bigger injectors? throttle body??

What do you think?.... Im unsure how hard it is to reach 150hp.