Reduced wind noise would be the main difference, although the enclosed wheel wells might also reduce tire noise a bit. I haven't measured the noise level either inside or outside of the car, but the aero mods resulted in a very noticeable noise reduction inside and I can't hear any wind noise when driving. People have mentioned that the car is very quiet when I pass them on the road and when the aerocivic passed by on the Carolina Traveler video, it was very quiet.
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