Unfortunately, I overlooked the chance to video record it.

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.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black