i have driven the D4 not the S8 but an A8 non the less, and i must say i really thought the D3 is refined untill i went out in the D4, i dont know how they have done it but its silent and i mean there is just no road noise no tyre noise no engine note nothing, and it was like a magic carpet ride, not sure about the chunky tyres that were on it though but maybe thats what helped towards the ride comforts
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