Ahhh. Interesting. I remember building a set. Got all depressed looking at them unpolished.
Discovered that with the new thermal coatings, stainless was no longer necessary. Plus the stuff is just nasty to work with for headers.
These will fit if you make a Susa pipe for them, i.e., Two 180 u-bends then into the muffler.
Incidentally Steve Wilkinson says his new Ansa look alike mufflers fix the HP loss of the originals. You should check in with him on that issue.
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