I have owned all three. Started with an NB in 2000 then went to a new 986 2.7 in 2002 then a new 2006 S2K. Currently have a 2006 Z4MR. In terms of road noise, the Boxster was the best. Absolutely amazing car for travel with its dual trunk setup. Nice, roomy interior and quiet ride. The Z4 is also very comfortable to me. Lots more sound deadening. I had a lot of seat time in an NC PRHT and it was really loud in comparison to both the P-car and BMW. A lot less insulation.
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