Okay, bringing this back to the original intent.

I can't comment on the coupe but my sedan is still pretty quiet at freeway speeds. With light load, even in the "drone" region, the volume isn't loud. As long as temp is below 80 ºF, I don't use the A/C, preferring to run wth the windows down. Wind noise at speed drowns out the exhaust unless I have the hammer down. On longer trips, the windows stay up to reduce fatigue and allow for better enjoyment of music. The exhaust noise is unobtrusive.

Be aware quite a few have complained that the coupe GRIP contacts the road too often due to the coupe's different underside in re exhaust routing. The sedan comes from the factory with dual exhaust while the coupe uses the single sideways muffler. This lack of space leaves the dual mufflers hanging rather low.