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Disable cat warmup in HP Tuners. All you have to do is change the temp settings to a value the car will never see. This will remove the Catwarmup where the timing gets pulled negative and the car gets really loud. You will still have the normal higher idle which is necessary to get the oil and coolant flowing, but it will be far less noticeable noise-wise. There is no need to change fueling. The cat warm up is done by allowing the combustion event to complete while the exhaust vales are open, shooting much hotter gas directly into the cats. You need the richer startup on a cold engine as cold pistons don't light off stoich (14.1/14.7) very well until they get a little heat in the combustion chamber.
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