Most of the Fords I have still have the original Exhaust!. When I have exhaust issues I deal with a local custom muffler place (not a chain). He welds things up better than new. The Y pipe on the Explorer is only available thru Walker, about $100. It is a PITA to remove too.
There were a few OEM ones on ebay a few years ago, but like $150 and not worth the effort.
The muffler place welded it up for $25, and it is 3 years and still holding. The Lexus (and other Toyotas) have [censored] Exhaust, maybe a bit better quality than Walker.
I have a Walker cat on it though, Had a nice hole in the OEM. I probably should have brought it to the welder.