What I was told...
...when I bought mine is that Porsche designed it that way. They installed less insulation in the body/cabin so that the exhaust note would be more prominent. It was Porsche's idea that true enthusiasts would appreciate (and expect) more vocal exhaust as part of the thrill of the drive. Hence, exhaust noise penetrates into the experience more.
I can't independently verify that, but it seems a reasonable explanation to me.
JWK
'05 Atlas Grey Boxster
'08 Meteor Grey Cayenne
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