OUCH! Your not going to weld anything to that. Looks like that has been sitting in saltwater.this has seen better days, most definitely
a 2oo1... cannot tell if they had the frame replacement or just the Yota sprayon junk coating in the distant past
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i had to get my Gen1 taco muffler replaced a few years ago but it never split open that bad!Too late to implement any prevention.
Too late for repair.
Time to replace parts for a rebuild or For Sale sign or scrap it.