Well I jacked it up today and started the process of taking off the nuts. I had to cut two of them off with a Dremel Tool. It was the two nuts on the rear of the cat. Luckily I bought some more because I've done this before and had to do the same thing on my other one. I suppose tomorrow that I'll start the gutting process on the cats. I've got to do two of them and since one is bigger than the other, it will take a little more time. I plan on using a bigger drill bit on the larger cat. Ya, things will get messy, but hey the cats will breath better when its all done. LOL, that just sounds nasty.