Bluto, my '74 550 was exactly like yours just a few months ago- exellent condition and all stock except for the 4-1 exhaust. I finally broke down and bought a new set of OEM 4-4 pipes, which weren't even available back in the late 90's, but evidently they made a new factory run of them for replacements. Set me back $850, but I gulped and went through with it. Now I'm very happy I did. The bike just looks COMPLETE now, and I do love the look of the 4 pipes, especially from the rear. Your bike looks great, and you and I are both original owners- a pretty exclusive club.