Exhaust Problem Help

[nysvx10]

In need of ideas/fixes for my exhaust.

Problem: New York salt has slowly killed my exhaust and now it is deafening....The flanges on the pipe coming down from headers (containing cats and O2 sensors) have rusted off. The connection between these pipes and the primary cat is pretty much gone.

Solution: No idea. Do not want to spend the $300+ each to buy new pipes. Has anyone else had this same problem and if so how was it fixed(pictures would be great)Any ideas or alternative fixes out there????

Please help
Caleb