Unless ur super Dooper Anal about a tiny tiny tiny bit of HP increase... but if thats the case u should just heat wrap them instead..

Have always Used Ceramic Coated.. great results, But thats just me, been lucky enough not to get a weak one that cracks

Ceramic Headers have a reduced amount of heat radiance, but it's more breakable, whereas true Stainless Steel is more durable, but gives off alot more heat.Ceramic coated headers are Usually not stainless steel, Thats why they are usually cheaper.

Have heard of Horror stories of peoples Ceramics Headers Cracking and Breaking because of Engine Flex.. and they werent Offbrands either..they were like DC Sports and such

Hope that helps ya out a lil