Matt,
I've spent a decent amount of time in my Pagoda on the Autobahn, primarily to drive from the port at Bremerhaven or sometimes Frankfurt to group events in France, Belgium, Germany and the UK. I have a 3.27 yearend installed and it does make the ride more enjoyable.
I have generally been in a hurry trying to get to the events and then back to the USA so I did not have the luxury of taking the scenic route in my car-I needed the fast, direct routes.
I always use the soft foam earplugs as I drive. Even with the 3.27, the wind noise can wreck the nerves and I always felt more rested upon arrival with the reduced noise.
In the future though, it will be the scenic back roads for me!
Best,
Tom