So, you've already taken some measures to reduce the heat.
Looking at the European, Australian, and Japan versions. They all have the same parts and part numbers as the North American RT for the exhaust system. Where is this 2nd catalytic converter located? Is there no way to eliminate it?
In Korea, the muffler was also equipped with a catalyst and silencer. So it was less noisy than a car. It was so quiet that people mistook it for an electric motorcycle when they passed by. HAHA...