This more of a comparisson. I have the mods in my sig and have gotten into prom burning. I'm far enough that I've got my idle BLM around 128. AKA the computer is controling the AFR and its doing ok.

So I had a Catco on my car and went through Emissions testing in Memphis anf failed. I changed only the cat to a Random Tech and passed. I didn't change anything else.

HC limit 220ppm CO limit 1.2%
Before 773ppm 5.23% Catco
After 8.32ppm 0.00% Random Tech

So for those of you that only have to pass a visual test Catcos should work fine. But if you have to pass a sniffer my vote goes to the Random Tech 8100 series.

Oh yeah, I'm only running one cat now not the stock duals.

David