I too was worried about road noise after reading review after review gripe and moan about it. You can read countless other sports car reviews that have similar dB values (and even those far louder than the Z) and not a word is wasted crying about road noise - it's all part of the "rawness" of other particular cars, yet somehow it's a detriment to the Z.
When I ordered my '13 I was geared up to purchase a bunch of sound deadening materials, but once it arrived I was shocked at how civilized it was inside and held off.
My daily driver is a Mazda3, which isn't exactly quiet inside and was actually awful with the factory Goodyear Eagles - Continental DWS tires transformed that car, too.
Taking measurements with my cheapo SPL meter, my Z and Mazda3 are on par with each other (with the Mazda on Contis) except for on the worst pavement surfaces.
I am curious to see what Continentals do when the stock tires need replacing. If you do decide to use sound deadeners at some point, make sure to use the correct materials beyond just a dampening layer like dynamat - all it does its dampen vibrations but lacks the mass to actually knock down sound waves.
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