Do a compression test. If all is good it's just normal blow by and moisture in oil evaporating.
If you have an outlier or two, possibly busted ringland.
Can't comment on sound since I don't own a turbo NSX (have twin turbo 3000), but you don't want back pressure. Turbo will spool faster and
make most power with free flowing exhaust. If that's your goal, no muffler, and shortest, biggest diameter exhaust is the way to go.
Others will need to...
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