[madtrix]

I have a '05 matrix xrs injen cai, tanabe axel exh. and custom 2.5" piping but I am not happy at all and there isn't any reliable forced induction systems coming along. So I was thinking about a scion tc. There seems to plenty of options out there for getting some power. My question is what can I do prior to forced induction? I looking to upgrade engine internals first and see what results I get. Anyone have suggestions, examples