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Heat shield just around the cat. It's only 3 inches wide by 4 inches long or so on the HX A small aluminum plate with mylar on the other side with a concave surface facing the engine ought to be enough to keep it toasty. I would space it just a little bit from the cat itself(the heat shield) it also keeps air flow up around the engine and the exhausts to keep EGTs and block temps down.
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