Yokohama's advan db are very quite and comfortable tires no doubt about it. But there's is so much that a better tire can do to reduce compartment noise. I'd suggest you look into sound deadening sheets + mlv sheets to reduce the cabin resonance and block unwanted road and wind noise. The more you invest in it, the quiter the cabin will be.
Just a suggestion though, it's entirely upto you but most of us car audio members here on pw have done it and the results are pretty drastic if done correctly
