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Anybody ever put a Catilic Converter on their old Mopars? Wondering if it would get rid of the nasty old car exaust smell. Wondering how much performance you would lose. I come across used catilic converters all the time when I strip my destruction derby cars, usuasilly I just recycle them but...

Just wondering what is the purpose of the "trap door" that is inside the passenger side manifold on my 70 dart. It is connected to a round metal wheel on the outside that rotates when the door is opened I assume by exaust forcing it open. What purpose did this serve and how restrictive is it? Am...