The A4 2.0T Premium sedan ($31,450) is the entry-level model, and comes with a 2.0-liter, 211-horsepower turbocharged four-cylinder engine, continuously variable transmission (CVT), front-wheel drive, and speed-variable Servotronic power steering.   Also standard are AM/FM/CD audio with auxiliary input and Sirius Satellite radio, single-zone automatic climate control, cruise control, leather-wrapped steering wheel with redundant controls, leather seats with power adjustment up front, aluminum interior trim, split folding rear seat, sunroof, fog lamps, alarm, and 17-inch wheels.  

The A4 2.0T quattro Premium sedan ($32,350) is equipped similarly, but with all-wheel drive and six-speed manual transmission.   A six-speed Tiptronic automatic is optional ($1,200).   Yet another variation is the A4 2.0T quattro Premium Avant ($35,350), an all-wheel-drive wagon with Tiptronic transmission.   The Avant comes standard with the Open Sky panoramic sunroof.  

The Premium Plus package ($3,550) for all the above models adds three-zone climate control, iPod and Bluetooth interfaces, heated front seats, driver information display, Homelink, rain-sensing wipers, automatic xenon headlights, LED running lamps and taillamps, and chrome window trim.   A Sport package ($1,450) adds 18-inch road wheels, three-spoke steering wheel (with shift paddles on automatic cars) and sport seats and suspension.   Other options include heated front seats ($450), iPod interface ($300), Bluetooth/Homelink package ($700), dark walnut or almond beige ash interior trim ($400), floor mats ($200) and exhaust tips ($130).   Offered only with the Premium Plus package is a Bang & Olufsen stereo ($850); the 18-inch wheels and tires without the Sport package ($800); and a navigation system with 3G MMI, voice control, rear parking sensors, rearview camera, and color display ($2,500).  

The Prestige package ($9,200) includes 18-inch wheels, the Bang & Olufsen stereo with DVD player, advanced keyless starting, auto-dimming mirrors inside and out, memory for driver's seat and mirrors, compass, and voice-control navigation with 3G MMI.   The Driver Assist package ($800) with lane change assistant, rear parking sensors and rearview camera; 18-inch chrome wheels with summer-performance tires ($850); adaptive cruise control ($2,100); the Drive Select package ($2,950) with driver-adjustable adaptive steering and suspension damping; the S-Line package ($2,450) with sport seats featuring Alcantara inserts, brushed aluminum interior trim, black headliner, unique bumpers and side sills, sport suspension and performance tires on 19-inch wheels; and sunshades for the rear and rear-door windows ($500).  

The S4 quattro sedan, powered by a 333-horsepower supercharged 3.0-liter V6, and available with six-speed manual ($45,900) or seven-speed S tronic automatic ($47,300) transmission.   Standard trim for the S4 is Premium Plus; also standard are high-performance tires on 18-inch wheels and S4-specific steering and suspension.   Prestige trim ($6,100) in this case includes all of the A4's Prestige goodies plus 19-inch wheels.   Choose the Driver Select package ($3,950) for S4, and you can also opt for an electronically controlled rear differential ($1,100) which communicates with the Driver Select electronics.   Exclusive interior options includes Silk Nappa leather seats ($1,000) and Carbon Atlas ($500), Stainless & Piano Black($750), or gray birch ($500) inlay panels.   Otherwise options are similar to A4, albeit sometimes priced higher.  

Safety features for all A4s include two-stage driver and adaptive passenger frontal airbags, side-impact airbags, curtain airbags, driver knee airbag, Backguard headrests; electronic stability control, ABS, EBD, Brake Assist, and tire pressure monitors.   Rear side-impact airbags are optional ($350) on all models.   As noted above, adaptive cruise control, lane departure warning, rear camera, and park assist are included in specific option packages; and quattros are equipped with all-wheel drive.