I'm about to finally assemble my 446 with ez heads. The headers that I've had in my parts hoard are 2" primary's with 3.5" collectors Dougs D452 un-coated that I've read nothing but good things about here. They look like a real quality piece. But I haven't had header issues. The headers on my 383 are hedmans I got for $150 and never even painted them before installing on the 383 and it's been driven lots through the 15 years and are still good. I expect the Dougs to be at least that good lol.