+2 - I notice this a lot on my daily commute on the M4. Some days I hardly notice it being loud, but others, esp when wet its really loud. This is not wind noise though, its cabin noise, mainly from the road. I'm thinking of sound deadening it all behind the seats, boot etc but a bit daunted by taking it all apart.
Fitting a tonneau and getting rid of the Bridgestones will help.
Have a tonneau on there already and have some Pirrelli Pzero Rosso on there from the former owner. Tonneau did help a bit. Just bought some of this stuff, which I hope will help a bit more - Second Skin Damplifier Bulk Kit. Had good feedback for it. Gonna do behind the rear cubby compartments (sub and glovebox out), the boot and then see what I have left.