words: Bill Cho, photos: Craigslist There are executive cars and then there are executive muscle cars. The C5 RS 6 falls into the second category. The first RS model (and only RS 6) to hit the shores of the States, it made quite an impact. Motor Trend said: "The RS 6 spools up with so little drama, it doesn’t feel as quick as it is. Until you look down and realize you’re going 20 mph faster than you thought you were–and 50 mph faster than your mother would want you to." This part...