Has anybody used these headers and how did you like the fit and performance??
They look a lot like Postons.
From what I've read they are good headers, but I don't have experience with them. I believe there was a run of them made and not many of them out there for sale. However, this community is about performance not rarity. Pretty neat that they were made by a big header company though, I would run them.
I went from a set of these to a set of ta's and the difference in spoolup was very noticeable on my car as nick mentioned above. Also, the flanges are only 3/8 thick and warp/distort really bad if used with gaskets.