from the factory it only came with one cat. then a resonator, then the mufflers.

ca is messed up with approved headers. you can still run a cat, and the egr vale can still be hooked up. so all the factory sensors are stil used.

no idea if you pass inspection.

the other way you can get close to headers and pass inspection is a front plog, and a 3 inch catted down pipe. not as good as headers, but better then stock.