In my paperwork for my 75 gt4 I have a statement from a ferrari shop that "the exhaust system also has been improved by replacing the non-available (failed) themoreactor with 2 catalytic converters." what exactly does that mean? 1. was the thermoreactor the original emmission control equipment which was replaced by regular catalytic converters? 2. Is that the same set up as what was put in the late 70's gt4 and other 308s? 3. If so does that mean I've got the same downgraded performance as those later models? 4. If so, given that there are no emmision control requirements on classics, can I just get rid of the cat coverters and regain my lost power, or do I have to add/replace some expensive other parts?