A passenger-side airbag was added in the 100s second year. A front-drive station wagon arrived late in the season, with a third seat in the rear for 7-passenger capacity.Rounded restyling of Audis midsize premium sedan kept dimensions close to the former 100/200 series. A V6 went under the hood for the first time, replacing the inline 5-cylinder engine. Dimensions were nearly identical to the prior cars, inside and out, but curb weight grew by some 250 pounds. Three versions went on sale: 100, 100 S, and 100 CS. Each could have either 5-speed manual shift or a 4-speed automatic transmission. A driver-side airbag and antilock disc brakes were standard. All-wheel-drive 100 CS Quattro versions came later in the 1992 model year: both a sedan and a station wagon. The Quattro wagon had a standard automatic transmission--a first for any Audi all-wheel-drive model. Also arriving later was a limited-production, high-performance S4 edition (successor to the previous 200 Quattro), with manual shift and a 227-horsepower