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Welp its all done and on there. We wound up cutting the muffler and piping off and just torching out the bolts for the cat. Put it together and the damn flanged between the cat and the muffler leaked (looks like the flange was welded back to far by about 3/16". Double gasketed it and no issues. Truck is so quiet now Im shocked.
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Cool. At 252K miles it seems like it lasted a good while. I'm likely to loose mine to rust before then. I think I've got 153K or so and my muffler looks 30 years old where as everywhere else on my 4Runner is rust free. I keep up on keeping things clean and painted but you can't really do that on something that gets hot and scraped on rocks. The cats are good and corrosion free but the muffler is a different story for some reason.