Maintanence on a 2002 Subaru WRX
I recently purchased a 2002 Subaru WRX, it has 110k miles. As of right now it seems to run great but I am the type of person who would rather keep up on preventative maintenance rather than replace parts as they break. Is there anything I should do with it(anything I should replace or tune up or modify etc)? I've heard turbos are fairly hard on engines, when should I rebuild the engine. Also, I would someday like to upgrade the turbo, any thoughts on this subject (what kind, other modifications I would need to accommodate this, etc). Thanks!