I like my '06 TSX a great deal, but the level of tire noise on long highway journeys is very tiring, especially with Interstate 5 up and down the western coast. 500-1500 mile trips are something I end up doing at least a few times per year.
Honda/Acura in general does not seem to control transmitted noise into the cabin as well as some other makers do (we own an '03 Accord as well). I have tried several different tire lines on our Accord and none have made a big difference in noise levels. The TSX still has it's factory Michelins which are in good shape with plenty of remaining tread life.
Has anyone tried having aftermarket undercoating applied, and if so does it significantly improve noise levels?
How about this QuietCar polymer technology?