[NickBoz]

CarMax usually under appraises my car, this could be because I am located in SoCal? But that would confuse me because the car market here is very strong. If I want to trade in a car I usually just take it to the dealer, unless I am buying my next car privately.

From different friend of mine who have sold cars to them, I hear either they got high kbb or under kbb offers, but so far nothing above. (Cars with no exterior mods)

Guess it depends on how aggressive the market is in your area...