Does anyone know if a universal 3-way cat without the air injection tube can be modified for air injection?

Thanks

 

Well what's the purpose?

Are you doing it so that you actually introduce air into the catalytic converter to provide a more complete combustion of exhaust gasses?

Or just to pass a visual inspection?

All in all I don't know whether it can be done fully functionally. I'm not sure whether non-AIR cats are designed the same way. But if you're just trying to pass a visual inspection I doubt that it matters. You could just weld up some metal tubing to it in order to make it look as if it has a properly functioning AIR system.

Somebody else should probably jump in here.

 

Unfortunately it must function...evil smog cops!