Cats Exploded. Suggestions?

MoulaZ

Well here's the very important thing. Prior to this happening I was struggling to diagnose weird AFRs on Bank 2, the same Bank that ended up dedonating that Cat.

Only Bank 2 went. Bank 1 is the 'before' photo.

Turns out my Plenum gasket had developed a very small tear, for the Cylinder 6 runner and was the cause of my whacky AFRs.

What I suspect happened was one day while conducting some 'tests' and revving it out, right after I hit redline (and rev limiter) I heard a small pop followed by brown smoke bellowing out my exhaust, which I think I mentioned already in OP. Had I not had the AFR issues on that Bank 2, probably wouldn't have happened I think. Could have been a little bit too much fuel was dumped, and ignited in the Headers and blew out the Cat? I dunno, but it seems kinda plausible.

Photo of the tear I'm talking about:

Attached Images

2017-04-01 19.09.13.jpg (310.6 KB, 20 views)