The models of the B5 chassis A4 seemed to bring changes nearly every year. 1996 was the launch year for the mostly new but evolutionary A4; it was, for most intents, quite similar mechanically to the outgoing 90 quattro, which itself seemed to receive upgrades nearly every year. 1997 brought some major changes though; the introduction of the 1.8T turbocharged motor into the lineup signaled the first time the small chassis Audi had forced induction outside of diesel motors. To celebrate, Audi offered the turbo 4 in some exclusive colors called “Cool Shades”. These were, in fact, part of the earlier “Lifestyle” colors that had been available on the B4 chassis; Brilliant Yellow, Tropical Green, and Aquarel Green were offered alongside Pelican Blue (which replaced the earlier and quite similar Kingfisher Blue) were exclusive colors to the 1.8T in 1997. Select the sport package, and you’d also get the Jacquard Satin cloth along with the 16″ 5-spoke wheels shared with the 2.8 models and a 3-spoke sport steering wheel. Though 1.8T A4s are a dime a dozen, with these options selected they’re quite rare – and of those Cool Shade exterior colors, Aquarel Green Metallic might be the rarest: