The Audi A4 returns with minimal changes to the interior and exterior. The front wheel drive A4 sedan is available with the quattro full-time all-wheel system. The quattro system is standard on the Avant wagon. All models are available with either the optional 1.8 liter turbocharged engine or the 2.8 liter V-6 engine, both of which feature five valves per cylinder. Standard features include side impact air bags and an air filtration system. The A4 is available with either a five speed manual transmission or an optional five speed automatic transmission. An automatic transmission is optional and includes steering wheel mounted Tiptronic controls. Other options include a Convenience Package and Sport Package.