Guys, I just picked up a set of what is supposed to be TTI headers for my 340 in a '73 Cuda. When I look on TTI's site, I see nothing that looks like these. They are a straight 1 5/8" (not stepped) to 3" collectors. They were supposed to be coated stainlessbut they look like just stainless to me. Can anyone ID these? I see no stampings on them. Thanks!