I would like to contribute. Personally I do like the factory-fresh version of X-Wing, especially as a museum/display piece, not least as there are so many film-based battle-scarred X-Wings already out there.
However... the exhausts are (apparently) carbonised. They're brown. They're dirty. They're heavily used. But the rest of the ship isn't. At least that's how it looks to me: most parts pristine, some parts heavily weathered.
EDIT: update of a tarnished and cleaned version of the same pair of exhausts.