you wont get 200 easy.... I have swapped in a 2.3L with Header, tune, CAI, muffler.... Making what... 180 if I am lucky.. still NA
you can polish every part of your engine 2.0l and after spending more money on them upgrades than buying a new Ford Focus ST you might barely make 200, when for $350 you can add a 50 hp NOS and call it a day.. and still get 30 MPG
Dumping crap loads of money into the NA engine is not worth it if all you want is speed..
So either Boost or hot shot if on the cheap... IMO...