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A4 1.8T models are powered by a 1.8-liter turbocharged four-cylinder. The A4 1.8T sedan ($25,250) comes standard with cloth upholstery, a five-speed manual gearbox, and front-wheel drive. Standard amenities include dual-zone climate control and a 150-watt, 10-speaker stereo with six-CD in-dash changer. The 1.8T is also available with front-wheel drive and a Continuously Variable Transmission, a stepless automatic transmission ($26,400). The 1.8T quattro is available with a six-speed manual ($27,450) or a five-speed Tiptronic automatic ($28,500). The A4 1.8T Avant quattro comes with the six-speed manual ($28,450) or the Tiptronic automatic ($29,500). The Avant adds four-way power seats with adjustable lumbar support to the sedan's list of standard equipment. A4 1.8T Cabriolet ($35,250) shares the wagon's power seats and is available only with the CVT and front-wheel drive. It also comes with a more powerful 180-watt stereo.

The A4 3.0 features a 3.0-liter V6. The A4 3.0 front-drive sedan ($31,150) comes standard with the CVT, 12-way power driver's seat, leather upholstery, an upgraded stereo, driver information display, and other luxury and trim items, in addition to the V6 engine. Quattro sedans add a 12-way power passenger's seat and are offered with a choice of six-speed manual ($32,940) or Tiptronic ($33,990). The A4 3.0 Avant comes only with quattro, and with the six-speed manual ($33,940) or Tiptronic ($34,990). The A4 3.0 Cabriolet is offered with either the CVT and front-wheel drive ($41,800), or quattro and Tiptronic ($43,550).

The S4 is a high-performance variant that shares the same three bodies, but is powered by a 4.2-liter V8 rated at 340 horsepower. The S4 is available as a sedan with six-speed manual ($45,650) or six-speed Tiptronic ($46,800) transmission; Avant with six-speed manual ($46,650) or six-speed Tiptronic ($47,800); or as Cabriolet with the same transmission choices.

Options include a 215-watt Bose sound system for front-drive sedans ($900), the same system with a choice of Sirius or XM satellite radio for Quattro models ($1,000), a navigation system for 3.0 and S4 ($1,350), and OnStar ($750).