the point he makes about how it handles pot holes stands out to me since i've been in my fair share of automobiles that make you feel every last dip and rise out of that pot hole rather then going the complete opposite which is what the Elantra Sport does here. its little things like that which makes this great for the city as we know roads aren't always the way they should be.
The engineers added more insulation to reduce road noise and vibration so that's why it's so quiet in the cabin. Small little pebbles shouldn't make too much of a sound either. The exhaust noise should sound good from the outside as they;ve added porous material to the air intake pipe. Guess it's just not as loud from the inside.
I appreciate a quiet cabin though. I do prefer a nice growl on the outside but want it quieter in there. Rocks and pebbles tend to generally make little noises but you barely notice them unless there huge and hitting you hard