So you want more power out of your 4G63t? Make sure you learn a few things before making some common "noob" mistakes.
The first thing you need to do is a complete a tune up.
Replace all worn belts, including the timing belt and balance shaft belt.
If the timing belt/balance shaft belt haven't been replaced within the last 60k miles, or you're not sure when they were last changed - change them now. If they break, you'll be paying for a cylinder head rebuild (not cheap).
You'll also want to change out all filters, fluids, worn hoses, spark plugs/wires, and worn/leaking gaskets.
Check the compression, do a leak-down test, check your ignition timing, etc.
Basically, do all of the checks that your repair manual tells you to do - you do have a repair manual already, don't you? If not, pick one up now before moving forward with any modifications.
Once you've gotten all of the necessary maintenance out of the way, you can start with the modifications. We've broken it down into two common stages to help you achieve your goals gradually.Before you start shopping for big turbos, intakes and headers, read our article on the common mistakes and misconceptions by newbie and read the staged upgrade paths to the right.