You have 165 at the crank; per factory specs. Which means you're pushing around 130hp to the wheels at a liberal estimate. To achieve 200whp, you'd be pushing about 250 at the crank or better; more hp than a stock WRX.
200 crank hp will put you around 160 wheel hp which is respectable. I won't claim a number until I dyno, but a very similar build to mine was making 177hp at the wheels (NA) which translates to about 220 at the crank; slightly higher than a WRX.
Basically, take whatever hp you make at the wheels and multiply it by 1.25, or whatever you make at the crank and multiply it by .8. 20% drivetrain loss is a loose guess, but is close enough for estimations.