S4 models are distinguished by fully painted bumpers, xenon headlights with contrasting titanium-colored inner housings, aluminum-finish exterior mirrors, and a trunk-mounted rear spoiler. The S4 Avant is further distinguished by its aluminum-colored roof rails.
Safety features that come standard on all A4/S4 models include antilock brakes, Brake Assist, and Electronic Brake force Distribution (EBD); an electronic stability program (ESP); dual front airbags that deploy at different rates depending on the severity of a crash, front side-impact airbags, and three-point seat belts at all five locations with pre-tensioners and force limiters in front. Sedans and Avants also have curtain-style head-protection airbags for front and rear-seat passengers, while the Cabriolet's seat-mounted side-impact airbags are designed to provide head protection. The Cabriolet features an active rollover protection system located in the double rear bulkhead. Should the car roll, electronic sensors trigger two protective hoops that pop up from behind the rear seats in less than a second. Together with the extremely rigid windscreen frame, these hoops help to maintain an intact survival zone designed to protect all occupants. Rear side-impact airbags are optional ($350) on all models except the Cabriolet. Next Page