The Audi A8 and its S8 sibling are entering their final stage with a facelift of the fourth-generation model, internally called D5. Basically, Audi went through the motions of a mid-cycle facelift with changes as minor as they can be. The big news, literally, is the massive front grille, proving wrong everyone who (understandably) thought it wasn’t possible to graft a bigger front opening onto a luxury sedan than Audi had managed pre-facelift.Clearly designed to humble the bloated kidneys