Playing Nevada's Smog Game

Cat, Cat, Cat!
Mine wouldn't pass. In Co. pass it once, get a 10 year collector plate and as long as you don't let the plates expire you never have to have it tested again.
I bought a cat from NAPA #15036, put it on, drove straight to the test, passed it, drove straight home and put it on the shelf for the next car.

Worked for me.