I think what he is refering to is a metal sheet to hide the catalyst. (Cat) But people are mistaken what the catalyst is and what the muffler box is. 1: Muffler 2: Catalyst. What he is probably looking for is something to hide the big muffler box. (Part 1) If the police pulls you over in Germany the check if the bike still has all the original exhaust parts installed. So removing it from the bike is not an option. And Adam, sorry for stealing your picture.