My exaust is slowly rusting away. What kind of preformace problems can I expect as it gets worse? Is this something I can fix without welding? How much would it cost to have a pro do it? How can I determine if my catalitic converter is working okay? Any help would be much appreciated. Thanks .88 4runner efi v6 3.0 liter, auto trans.

I just had my exhaust replecd for a 100 bucks...new muffler and pipe up past the converter and out the back..that would be your best fix