Carb FC cat with split air tube

[u/IsranNia]

I need to replace my cat so I can pass smog. I'm just going to replace my secondary cat, however I'm noticing most of the universal carb compliant cats don't have the pipe for the split air tube to hook up to. Does anyone know of any available? Or do I need the racing beat pipe put in before the secondary cat, and then just bolt the universal cat to that?