Only if something is needed for another test, never on a production car! The company build lots of test cars that are just driven, but can never be sold. They usually come with a mis-mash of options that are crazy. Red interiors with blue dashboards and grey headliners with tan carpets etc.

All of these cars you see on the streets of Munich / Spartanburg with taped camo will eventually be crushed or cut apart to see what's going on.