TTI 1 5/8" to 1 3/4" step longtube headers:
https://www.ttiexhaust.com/TTi340.htm
TTI 1 7/8" race headers:
https://www.ttiexhaust.com/TTi34017835.htm
I see prices have gone up even more, over $1000 for ceramic-coated. IDK who the hell can afford these anymore, I imagine most of their customer base is wealthy B/E-body guys at this point?