I would NOT buy a ceramic header !! That is one of the few things i regret buying when I owned my Honda, it cracked and it is made of mild steel so if you bottom out on it, it will literally collapse in on itself. trust me, there is a reason why ceramic is cheap, and nobody thats fast uses them. if I was to recommend anything it would be to buy a stainless header then have it ceramic coated by someone like a1 ceramics, this is a true ceramic coating.

This is what quality ceramic coating looks like:

Aluminum and cast iron