Upgrades and Value Relationship?

[vesnyder]

Anybody ever tried to assess what upgrades and/or improvements increase the value of a car and which ones never do? I am thinking of the annual article on housing improvements that say, for example, 80% of the cost of a new kitchen can be recouped when sold? I have to assume aesthetic items are on top of the list, and performance items less so? Anybody ever seen anything like this?