NewCelica.org is where u need to be. i own a 2000 GT and just have exhuast done, cuz the 1zz & 2zz motor dont really have any real gains of power unless u go boost.

there are people wit 5 or 6 grand in there GTS and are bearly making 200WHP, they are far and few. i made the decision wit my celica i would go wit all suspension mods instead of trying to mod something that will have no real gains as far as power. so if i where u i would look into the blitz SC kit they sell for the GTS or look into going turbo.

to be quite honest i feel the Blitz SC kit is a waste cuz they cost like $3,500 (not including shipping) and people are only making like 215-225WHP wit supporting mods and atleast 8-10hrs. of tuning. if u spend the same amount on a turbo kit u will make about 250-275whp on 8-10LBS of boost and a good tune.

also MonkeyWrenchRacing.com has a ton parts for our cars. might wanna check there site for internals, cam, high & low compression pistions, valve, valve springs etc... they are reasonably priced and probably the only site i know that sell internals for the 7th gen celica. Good Luck wit ur dicision though.