The Flowmaster kit uses a sloted pipe (to allow for a smaller ID/OD difference betwee the 2 pipes)and a narrow band clamp.
My kit doesn't have that clamp setup. My kit has the old style clamp setup.
Good call on the serviceability issue. I like your plan to use a combination of welds and flanges to make some sections removable. I've had my engine and transmission out and I think they're about done as far as restoration goes...but you never know.
