Addressing the factory cat and resonator situation is the way to go from my last year of gleaning threads for the heat issue, and I live in Canada, yikes......
After an hour of driving my female passengers are encouraged to remove articles of clothing one at a time until comfy, and they usually comply. Perhaps this is why I am hesitant to install my complete exhaust system staring me in the face 5 feet from the car.
Keep in mind male passengers are instructed to keep all clothing in place, and enjoy the 190mph sauna!!
the motor runs hot, no doubt, but the collection of heat at the cats, right at your feet, amplifies the problem, they gotta go!!! The extra hp and music from the pipes is all bonus material......haha