Imagine it would fine unless its massive. My dad had his smogged in Las Vegas with a huge hole and it passed they said it burned amazingly clean yeah I wonder why. Hold on I have smog guys next door let me go ask(pause) He said if it a hairline crack is should be fine.
Mine is about 75 % cracked around the two to one collector and it passed with flying colors back in August. I put 91 octane in it and drove it for about 30 mins before taking it to the smog guy to make sure it was good and warmed up.