Originally posted by Terry Haines:
The hole drill method is not good.Apart from the brick there is mesh and a mat to get out,which does not crack up like the brick.To do it right cut it open and get all the guts out or you can clog the main cat with the mesh etc you leave behind.
Drilling a hole is only to break up the cat Terry. The mesh and packing material can still be pulled out through the manifold exit. As long as the hole drilled is large enough to see inside, say 11/16" or so, you will be fine. In fact, it's harder to not get the steel wool type junk wrapped around the bit than it is to leave it behind in my experience gutting them.
