First things first. Your second post is actually your second thread, about a subject that has been discussed for years in these boards. Please, do a search before you create a new thread, you spare us from having to go through thousands of useless threads to find what we need to know.
Secondly, there are stickied threads at the beginning of each board of the site, marked with a sign that reads "
Read This!". In the "More GT4 FAQS" thread you will find your answer. I will spoonfeed you for this time only.
This is the thread you need to read to know your answers about the "Black Beauties".
EDIT: Tree'd by MinoltaMan89
All this long post for nothing