You will get more power with a ceramic coated header. The ceramic coating is not just for looks. It is a smoother surface than bare metal and makes the exhaust flow better (Especially with a cat back system). You can have your factory header coated but im not sure who from or where. Dont think the hp gain is gonna make you shit your pants, but you will deffinatly know you have more power. Almost all noticable gains will be in VTEC.