k03s turbo is the basic upgrade...then it would be another remap and thats basically it
cams have been seen to be pointless..and some cases lose power
theres been an increase in the number of nitrous users recently...its cheap and instant
but basically if k03s isnt good enough theres other turbos to consider...AM04, JBS04, ATP eliminators, IHI...all been done already but big bucks
at 200-220bhp off the line is abit silly, just cos of wheel spin, 30-100 though its great fun and really doesnt take very long,basic imprezas wont stand much of a chance and nor will clio sports or the CTR