My yellow T/A still wears all but one muffler of the original exhaust system (clamps and hangers included).

Just prior to me getting the car the 3rd owner replaced the original drivers side muffler with a NOS one. I also got another NOS one in the deal.

For the most part all other parts are in pretty good shape except the one original muffler (pass side), it is rusted thru in spots and sounds bad.

My question is do I replace the entire exhaust system or just the parts that need it...and I'm going to remove the one time NOS muffler and replace with correct repops.

I have all the other parts to replace everything...but want to stay as true as I can to survivor status.

Thoughts?