Obviously these last two answers know nothing about the 3S-GTE engine. You can do darn near anything you want with this one. If you can think of it, it can be done. This engine has as much aftermarket support as any Honda (and Hondas have tons of support). Remember this: Your engine is the same engine toyota used in the Toyota Celica All Trac turbo- which is a rally car with a license plate and some luxury features. If this engine is used in a rally car, you can believe that there are tons of stuff you can do to it. A friend of mine used to have a '92 MR2 turbo and she had it modded pretty well. She was putting out 320 hp at the wheels. That's probably around 360-370 hp the engine is putting out. That maybe impressive, but the engines can handle way more power than that! Here's a link to give you an idea of what I'm talking about
:
http://www.racetep.com/mr2tpart.htm
There are others but this is to give you an idea of what you can do to it. Good luck.