for an 02 you can find a lot better for prob cheaper. A better exhaust, a used turbo, a cold air exhaust (your best bet).
check around in your town at a few car shops for tips. a beautiful Blonde hair and blues eyed girl will sway any mechanic into pouring out advice.
Just don't mention electric turbos... They have their uses, but not in newer "import" style motors, and are kind'a "the joke" in the engine world.
Good luck