What are the best headers and chip (for performance purposes) for a 2005 Mazda3 2.0?

I recently purchased a 2005 Mazda3 2.0 automatic sedan. Before I begin I will ask that nobody waste my time by saying sell the car and get a manual or get a hatch because I am keeping this car for a long time. I understand that I wont gain any crazy amounts of power no matter what I do unless I slap a turbo or something on it which isn't going to happen. From what I have gathered so far I wont be looking at any gains on an exhaust, just a ricey sound so that will probably be the last thing I do but for now I am looking into getting a set of headers and possibly a chip of some sort. What are some good headers that will give me a decent gain in power and what are some good chips you have had experience with that will help out the power? I have already purchased a CAI and am just looking to get every little bit of hp/tq gains I possibly can with this 2.0 engine. Any ideas are greatly appreciated and thank you for your time! And if anyone has any other modification ideas other than headers and a chip that is also greatly appreciated! Thanks again!