Pounds per HP is very rubbish on the RS2000.
Best bet is a chip , full exhaust system including decat.Keep the airbox and pop a good panel filter in.Some respond well to that others dont. A few years back I had 175hp on the rollers with basicly the above with a larger tb.

The amount of work and cost to get near 200hp is stupid these days.
yeah you could pop some cams in but your only gain from ramping it around on a track as all the torque will be up top.. Have fun with it nice reliable car but dont expect too much from them.