What brands/companies make headers for a 2006 Altima v6 3.5 (3rd gen)?

Im buying a 2006 Altima SE-R tomorrow from my friend beacuse he is buying a Jeep SRT8, and Ive been looking for headers all over the internet but cant seem to find any other than OBX headers, but I've heard a number of bad things about them, for example a lot of people say that they make a weird hissing sound. Ive done lots of research and ive seen that some owners have cattman headers on their altima but when I go to the cattman website they only sell parts for the maxima and the Infiniti I30.

Ive also seen that other 3.5 altimas have had cattman, stillen, hotshot, and megan headers but im unable to find any for sale, so if anyone can send me a link where I can buy cattman or stillen headers it would be much appreciated.

Also what type of headers are better ceramic or stainless steel?