Hey Badart,
Do you have a part number on those Doug's Headers? They look significantly larger than mine and they break into pieces, which seems much more convenient for installation/removal.
I don't have a part number. I bought them lightly used from another member here. Like you I'm glad they come apart and should make install and removing them easier. They are only 1 5/8" primaries with 2 1/2" collector. I was looking for a set of TTIs, but these will do for now.