Fresh exhaust! - Toyota Carina, 1.5L, 1997

For a long time, when he started the car and he was idling, something rattled ... after a short inspection, I found out that the catalyst was covered.
I bought a flame arrester for 1500r and went to the service.
In the service, in addition to just cutting out the catalyst and weld in the flame arrester, they decided to cut it and see what was rumble in it)
The photo below shows a pebble that was pulled out of the catalyst, presumably it is a melted mesh))

Flame arrester - 1500r
Work - 1200r