quattro "vi" (or is it quattro v?) aka quattro with an fully active rear diff (operational under both power and braking) debuts in a real car. seems like a very nice development. georg kacher likes it. http://www.carmagazine.co.uk/Drives/Search-Results/First-drives/Audi-S4-salo on-2008-CAR-review/ dave '03 rs6 '04 allroad tdi