... wow that sucks! I could imagine it happening though.


Stacey has a Taurus SHO with a Yamaha V6 in it and we learned that it's common for the OEM cats to shatter, then get sucked back into the engine when you decelerate because there is valve overlap (both intake and exhaust valves open at the same time for an instant) so if manifold vacuum is high enough during a closed-throttle deceleration or engine braking it will pull the ceramic honeycomb bits all the way back up into the engine & intake manifold

I don't know if that's a possibility on your motor, just putting it out there.