Is that what those are? I was trying to orient myself under there, but mine is a '94 and the exhaust routes differently. Yeah, those are shot. I would do the bypass right away or keep the parts to do that job in the truck, because those aren't long for this world...The rear heater lines look a little rough. Nothing i'd loose my s*** over.
You could always get something from Cali or Arizona with a scorched paint job and everything cracked to s*** interior.
Pick your poison.
Other than that, most of the rust seems to be on stuff that would likely be replaced soon or on the weld areas from the factory. I could get that cleaned up enough to use POR15 on the rust areas and then start dousing the whole thing with bar chain oil this spring. I doubt it would keep rusting too much. The real question is what else needs to be done? ALL of the normal baselining projects or are some of those checked off already? How does the interior look?