Ehh, some cars are already working around this. In my newer vehicle, the Catalytic converter is actually in the engine bay. This has an emissions benefit in th

Ehh, some cars are already working around this. In my newer vehicle, the Catalytic converter is actually in the engine bay. This has an emissions benefit in theory[0], since the cat will heat up faster. But as a side effect, GL trying to get it out. [1] [0] - I say 'in theory' because some folks have had issues with unburnt fuel getting into the Cat and -then- combusting, which is of course bad for the converter and shortens it's life. [1] - Probably also means replacing it legitimately is a stupid amount of labor though.