I lined every nook and cranny of my sills with lava shield and wrapped the high flow cats in heat shield armor with stainless steel zip ties and the sills still get burning hot on shutdown. The problem isn't so much while it's running and moving, it's the lack of ventilation from the hot cats once the car is stopped and the heat builds. You have to ditch the cats all together if you really want to solve the problem.
IMG_1133 by Rapidrezults, on Flickr
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