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bought my 944 with a hacked up exhaust and went through probably half a dozen different iterations of muffler combos before I found one that sounds good, doesn't weigh a ton, and isn't raspy.
Im interested in knowing what did the trick for you
Some of the links are down... here's mine with 2.5in glasspack/resonator where the cat was and a borla xr-1. I forgot the size but it was the smaller of the two. Next attempt I'll be going larger muffler.