My friend's dad has an Audi S8 which he says sells for about $100,000.

a)The Kelley Blue Book Value is under $50,000. What specific type of additions call for such a large price increase?

b)I drove the car and found it to be very quick and smooth, but it was a little awkward to drive because the car's exterior is more exposed than on most cars (rather than having plenty of window space,) which gave it somewhat of a rigid feel. What luxury sedans have a very smooth look/feel to them in addition to a great ride?

Thanks.