New
Davico 14412N Direct-Fit Catalytic Converter Assembly ~$250 delivered
possibly equivalent to
AB Catalytic 44810 or
MagnaFlow 23661.
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Before installation, I'll remove all the oil & stickers (by washing with brake cleaner & PurplePower), add a hanger & flange near the muffler, and prime & paint the assembly like I did the exhaust manifolds.
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UPDATE: Since it's closer to being drivable, this is now on my '95B XLT 5.8L: