Would my car pass emissions straight after having my cat replaced? (Code p0420)

when I have seen them there, they had a couple different sizes. But that was a long time ago.
to be honest, I did this once. check engine light came on a week before inspection was due. I was getting rid of the car in about 6 months when a new vehicle was coming and did not feel like dumping money into a car that was just going to the junk yard when the new one came. I do not condone doing it. especially if you are going to keep this vehicle. but if you are short of money and need a vehicle to get to work and as a temp fix. well, who am I to judge anyone.

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