Your conversation was closed so I cant reply, but if you get the engine vin i can figure out what motor you have. Exhaust is all interchangeable you just need to use the early adapter if you want early type exhaust and take them off if you use a late model exhaust.
I had a 1973 CB750 and put on 67,000 miles with no problems. Then I had a 1982 Goldwing and put on about 60,000 km again no problems. Next was a 1984 Goldwing only about 30,000 km but again no problems.