Hi


I'm actually owner of RS6 C5 - very nice car, but not for me - not for daily driving -
I also own A6 Allroad BiTDIfrom 2015 (facelift) and lacking in C5 all safety systems.


Thus I know 4G platform (Allroad) all it's electronic stuff (MIB2, matrix, etc).


I planning to buy RS6 4G (C7.5) so 2015-2018+ Performance (605PS)


What should I look for and what should I avoid.


My doubts for now are:
- 20 vs 21 inch wheels
- ceramic breaks
- general cost of owning RS6


What are the pitfalls and possible fixes for them ?
(change to 20' wheels, change discs to metallic, etc...)