Looks like a worthwhile project. Obviously this bike was thoroughly enjoyed by the PO. (and I though mine was in rough shape...)
I dont recognize the exhaust either. If its lighter than stock, keep it. If not, ditch it. Stock SS muffler is friggin heavy.
990SMT, 640A, TXC450, TE510, ATC350X, ATC200ES, 550MXC, BW200. Need more space in garage.