Dear Jesus, for I do not know the total yet. Went into this with an open mind(wallet). All going to be based off of time invested. This one will be on the high side. I went stainless on everything, and tig welded as well.
Open ended T&M ticket for customers headers is a bit scary, but those headers look divine!
I've been curious about custom headers made with individual mounting flanges for each pipe and clamp-on collectors. This is how they are done on many shelby cobras. You can piece them together one piece at a time and it's a lot less cumbersome than dealing with a giant header assembly.