Schumacher Mi9 - Option parts - Shiny or necessary?

In this video I'll show all the option parts I choose to run on my Schumacher Mi9. But most off all I'll explain why I choose te run them.
Michal Orlowski uploaded a the list of all Schumacher Mi9 Option Parts which are suggested to use for different track conditions. I'll explain each of the option parts and it's benefits and in which racing conditions they could be used.
Option parts used:
U7828 - Titanium Ball Stud Low www.racing-car...
U7866 - Lightweight foam bumper www.racing-car...
U7837 - C/F Upper bumper brace www.racing-car...
U7839 - C/F Lipo Swivel www.racing-car...
U8323 - C/F Lipo Hook www.racing-car...
U7816 - Alloy Radius Arms www.racing-car...
U7827 - Alloy Lipo Mount www.racing-car...
U8065 - Alloy Thread Insert www.racing-car...
U8729 - Trans Housing High www.racing-car...
U8570 - C/F Split top Deck www.racing-car...
U8730 - Ally hub carrier www.racing-car...
U7866 - LW Foam bumper www.racing-car...
U8768 - Lower Shock Mount Alloy www.racing-car...
U8776 - Alloy Eccentric www.racing-car...
U8772 - Alloy Spring Seat www.racing-car...
U8800 - Pro Ball Bearings www.racing-car...
U8770 - K-Coat shock body www.racing-car...