The muffler question is all personal taste. I prefer a muffled powerstroke but many others prefer a straight pipe.
As far as intakes go, search the internet for "tymar" or "6637" in conjunction with "powerstroke". By far, about the best filtration and flow you'll get.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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