you can buy a bolt on turbo from greddy for the 1.6l for 3k and be at an easy 250whp. if you really want to have some fun with your car then here's a list that will totally change how the car performs.
-suspension
-bracing(butterfly,rollbar,tower bar)
-intake,header,catback (all racingbeat)
-15-16inch wheels...lightweight
-low profile tires, preferably falken azenis or toyo proxies

if you want to discuss anything, PM me and i would be more then happy to help you out. i daily drove mine at 400rwhp, but was capable of almost 500 on 110 octane at 30lbs of boost. it all depends on what you really want out of it. if you want big numbers, swap in the 1.8l. 94 block, 99 head.