just love those thermoquads !
it took me a looong time to figure out how to tune them, but after i figured that out, i was in hog heaven !
as said, parts for those can sometimes be hard to find, so i have a bunch of them on the shelf, and every so often, i can pick up another one for next to nothing.
if i need to use an adapter, i use the ones that are nicely cast, or i machine one out of 3/4, 1", or 1 1/2" plate chunks i have laying around here. blended in to the intake of course.
i have always wanted to try a tunnel ram with twin thermoquads, but have never had the opportunity to do so.