Right now im trying to decide on which header im going to get. Im pretty much looking on ebay at all of them, and ive found that there are some cheap ones, but dont most do the same job? My question is which is better, a 4-2-1 two piece header OR the 4-1 one piece header. Im really clueless on which is better and all, so if anyone could help me thatd be great. Also what kind should i get, the ceramic coated or stainless steel? and Does it really matter?