laugh if you want, Cat lover state....

You only need one...don't get one with an air tube.

I don't know how stringent things are in the Governator's reich over there in So-Cal, but I can share my expierience with Catco.
I got a pair of Catcos direct-fit cat pipes for my late Crown Vic. They worked great. The muffler shop I went to (literally "The Muffler Shop") hooked 'em up and on my install just welded the air tubes shut.
I'm going to get a Catco direct-fit cat pipe to back up my Ranger header.
So, in conclusion I recommend their products, but if I were racing I'd probably use Dynomax's cats. Though I can't imagine a difference, all honeycomb catalysts look the same to me! Must be another case of "The Brand-Name Syndrome".

I bought a 3" convertor from.......(brand slips my mind)..... at autozone because I work there. It was fairly cheap and lifetime warranty. Just a thought. I do have catco convertors on my 351w coupe and never had a problem.