I have a 2004 Accord Ex V6 auto trans, currently I've only changed out the exhaust system to straight 2.5" piping from the cat (resonators deleted) with flowmaster original 44s, and a aem cold air intake with a bypass valve. I was looking on replacing the headers, and wasn't sure if it'd be worth it. Some people say it isn't worth it with an auto, while others have said it's not a problem. Opinions?

 

Headers? Isn't the 4-into-1 collector cast into the head?