There are two types of termis. One without the cat and one with the cat and homolgated for "road" use. The ones without the cat have the ECU update and filter. The others do not.
Homolgated for "road" use does not imply they are homologated for emission and have cats. I have checked this out with SC-Project where some of their models are Homologated also but just for sound. They don't have cats. Homologated does not imply they have cats.