Well, after input from the forum (thanks to all) and much searching through CARB and MVC documentation I decided to forgo the aftermarket and illegal aftermarket catalytic converters. Instead I decided to rotate the cats 90 degrees for better clearance (also had a custom cat-back done at the same time) and all I can say is RIGHT ON! My wife was pissed becuase she actually thought I had the truck lifted without telling her. I'm not running and sliders or 'boards so the cats were the low point on the center of the truck. Man, what a difference! Anyway, I'll deal with slider mounting problems when the time comes if there are any, pics to follow when I get 2 free seconds this weekend!