The fiberglass tubing and whatever you glue it together (if needed) with also need to be exhaust rated. I went through all this when I had to replace the tubes going into the mufflers due to some PO over-tightening the hose clamps. Speaking of which, be sure to get some "crush rings" for the ends of the tubing so you don't end up with the same issue.
Might be worth consulting with one of the exhaust specialists like D'Angelo or Marine Exhaust Systems, who can also sell you the parts.
This is a system that can sink your boat or burn it down. And the hose does age which is likely why the surveyor marked it.