I currently own a 2003 Lancer OZ Rally Edition and I was wondering what you guys would recomend intake, exhaust, and headers. Along with a site where I could find these parts. I looked and could not find a place for headers. I was planning on purchasing a AEM cold air intake for my car and a Borla muffler and tip but when I went to the Borla site they didnt have any could any one help me out.

well, you can use any borla muffler, you'd just need custom piping made.

http://www.roadracemotorsports.com/ <-this site sells most of the parts you want