Unfortunately, I overlooked the chance to video record it. :mad:

With the car on the lift, he repeatedly air-hammered the faulty cat material, then started/revved the engine to blow out the debris. Very simple and effective.

Yes -- California would not allow this, and I originally did not do the work since i was concerned about the rules here (Virginia). But the secondary cats are behind the O2 sensors and thus irrelevant for emissions testing, which I passed easily. :)