Wissel,
That video is 4 years old. And I bought a gt 220 new in December 2009. The Cayalytic converter were ceramic honeycomb discs in the exhaust. They disintegrated within 3 months.
NC replaced them with stainless steel discs free of charge. Now I have a different gasser and it does not have any catalytic converting discs in the exhaust. However, it smokes less and gasifies sooner.
Just saying, gimmick.