I have a 2003 lancer ES and want to do some upgrades on it like putting on a performance muffler and other things but i don't know what brands or type i should get or what would be a good fit for my car and have a good sound to it?? any suggestions? and what other things could i do to my car besides rims, tires, spoiler, or interior neon lights which i am in the process of doing...

 

please don't do neons...the only thing that will get you cost effective power is a tune or turbo rest are just for sound/looks. going full na will get you tops 15hp.