CA cats are ok on a federal vehicle. It needs to have the same number of cats in the original configuration.
Q. Federal vehicles are not listed in California application catalog. How do I determine what
catalytic converter to install on a federal vehicle?
A. Find a catalytic converter exempted for a California vehicle that is
of the same make, model, and model year as the federal vehicle, except for the
engine family. Install the catalytic converter on the federal vehicle and make a note on your invoice and warranty card that it is a federal vehicle.