Possibly SQOD: if one were to wrap the cats + about 6" in either direction with some kind of heat shield, would the cats have a problem given the absence of air cooling?I think going back to the OEM fuel tank skid helped a little but I still got some fuel smell if not actual gurgle gurgle boiling and puking. Went ahead and had the skid drilled out around the cats. Hoping this helps to get more air flowing and reduce what I think is an oven that had been created. Not ideal, but I'm experimenting at this point.
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Also, I ran with all skids off for a while, and I'm not sure it made a huge difference. My issues resolved after new CC and thorough radiator cleaning.