The reason I am asking is that Honda dealer told me that the manifold in my car has rust and there is crack and they asked me to replace it, but they charge 950 bucks for it. I said not to do it..

So I wanted to see if I could put some performance part instead of the stock part and when I searched on the internet, I came across both manifold and header, but they look kinda the same. That made me wonder how on earth you could use both of them since the engine has 4 holes there, not 8.

So all you experienced guys should be able to help me out here. Correct me if I am wrong here.

All I need to do is buy a header aftermarket (not the ceramic one), which is more efficient and just remove the current stock manifold from my car and put this header instead? Is that right?