would it be better to get a high flow cat or just take the thing out and put straight 2 1/4 inch pipe. and also my headers are turning a goldish color is it because im running to lean and would it help to put bigger injectors in there. or is my spark plugs

If you don't have to worry about smog and emissions, rip that cat the hell off and put a 2 1/4 inch test pipe on there! From your last post, if you're only running an EX with intake and header, i don't think you're increasing the air flow that much to where you'd be running lean. The headers are probably cheap-o or something, don't know.