I'm looking to get some more out of my '07 gs, but I don't know anything about cars. I'm hoping someone on these forums could help me out. I'm planning on getting a new exuast - intake - headers - ecu. Could anyone give me some advice?

Intake - CAI or SR and what brand and model would be best.
Exuast - What type of catback should I get.
Headers - Don't know **** about headers, but a friend said if I'm getting a new intake and exuast, I should get new headers. What type/brand/size/whatever.
ECU - From what I know about this, it should give me more horsepower, better gas mileage, or whatever i map it to using a management system?

Sorry if I sound retarded and don't know what I'm talking about, and any help will would be appreciated.

 

If you have a lot of money to play w/ look into a turbo kit.