i have an ebay CAI ($50) but im a DIY type of guy, so i dont need any secure bolt on locations, i made my own hole (which is hella ghetto). The only thing u cannot go cheap on is the filter because your engine can only take so much ammount of dirt, Apexi or K&N is the way to go. For exhaust and headers, you cannot go cheap either because those high temp. applications must be test proven and have high quality control.
Universal muffler do not work, they are just hella loud, magnaflow was dyno proven and is better over a custom pipe.
I also bought Grounding wires off ebay and have worked pretty well, same thing with my AGX's, H&R springs, strut bars and alarm.
As for smog, i really dont know what to do when it comes time because with just a CAI, it should pass, exhaust would need to convert back to stock. Luckily my car still has good compression. w00t