Which parts (if any) in Macbook Air 13" mid-2011 can be upgraded to either:
- an original part from a later version of Macbook Air/Pro
- or a third-party component which has a better performance/extra features?
Which are those replacement work really well (eg with no compatibility problems; last at least as long as the originals etc)?
E.g.: CPU, SSD, RAM, main board, wifi/BT card, speakers, USB 3.0, camera etc.