Ear plugs?

Maybe ad dyanamat to doors and floors. I know there is already some noise abatement material in there but more does help.

Try quieter tires. I used to use MXV4s and was surprised at how much quieter other makes of tires are. Yokohama dbs are reputed to be extrodinarly quiet. Your gaskets around the doors maybe worn as well. You'll notice this as increased wind noise.