Well to be technical, under Federal law, you can't move or manipulate the cats without proving that they were damaged or stolen, unless it's a off-road car.
That being said, a catted X pipe would pass most emissions tests (but perhaps not a visual test) depending on your state.
Splice in X pipes are a popular 50 state legal compromise since it leaves the stock cats in place.
· 6spd 2012 Grabber Blue GT Premium 401A
· 3.73 rear-end
· HID headlamps & security package