Depends on what kit you are going with. Are you in a GT or GTS? 4psi will put you at almost 200 to the wheels in a GT, a GTS will be just a little more than 200 to the wheels. That is if you have a good setup.
gts turbo will give you only 200 whp? I sure hope not, that is shitty... 225-250 whp... on a gts is more acurate.