Meh. Let them go ahead with it. One, I want to see more results and two, I want to see said results without getting done for it. I'd personally never remove a cat from my car, and if I was to get something like this, I'd either go custom or find a way to keep the factory emission's control setup intact. As for ARIon, if you don't know what the Xede does, research helps: http://www.xede.com.au/about.php If you don't understand how that ties in, then more research will teach you. Hmmm would it be possible to get a less restrictive cat further down the system to still get the performance benefit of these/custom headers? Or would it still be restrictive to the point where it wouldn't be worth the minimal performance increase?