I'd figure out where the noise is coming from and have the dealer fix it. At 95 mph my rwd is whisper quiet. I have sound-insulating glass but that should not not make a big difference according to numerous posts on this forum. Porsche does a great job engineering their cars but the Zuff plant does not yet have all the bugs worked out -- even with sophisticated robots, process variation is still a real thing. Body panel alignment (and gaps) are not yet, IMHO, where they need to be (based upon my car's and other cars' fit and finish that I have scrutinized). A bit of panel misalignment in the wrong spot could for sure create unwanted wind noise.
Check the gaps in the side mirrors, those are usually the sources of high speed whistle noises since the gap in the rotating mirror assembly faces the air stream. Quick way to check is to just cover the gaps with painters tape and see if it goes away.