The much-loved Audi A4 wears its angular and athletic skin well. The trapezoidal "Singlegrame" grille dominates the front end, while defined wheel arches grace the sides and a distinctive shoulder line begins at the hood, runs the length of the A4, and ends at the tail. A 2.0L turbocharged 4-cylinder combined with the new 12-volt hybrid system powers the A4, now making 261 horsepower and 273 lb-ft of torque. It runs that power through a 7-speed dual-clutch S tronic automatic transmission and can drive either the front or all four wheels when equipped with Audi's famous quattro all-wheel-drive system. Quattro utilizes a locking center differential and wheel selective torque control technology, which ensures that the wheels that need the most power receive it. The S4 meanwhile, comes with a 3.0L turbocharged V6 making 349 horsepower and 369 lb-ft of torque. The gearbox is also different, as the S4 sends power to all-four wheels via an 8-speed automatic. Audi claims a 0-60 time of just 4.4 seconds for the high powered S4. Audi Drive Select provides four modes for total control: comfort, auto, dynamic and individual. Each mode gives the driver control over transmission shift points, as well as steering assistance and damper control. Standard amenities include auto-leveling xenon headlights with LED daytime running lights and LED taillights, 17-inch alloy wheels, Homelink integration, power adjustable heated mirrors with integrated LED turn signals, and heated windshield washer nozzles. Inside, three-zone automatic climate control, leather steering wheel, cruise control, leather seating, one-touch up/down power windows, rain-sensing wipers, aluminum inlays, power sunroof and ambient LED lighting as standard. Standard technology includes Audi's MMI infotainment system with a 10-inch color display, Bluetooth hands-free connectivity, two USB ports, two 12v power sockets, a 10-speaker stereo system and now Apple Carplay. The A4 is available in Premium, Premium Plus and Prestige trims. The Premium Plus adds larger wheels and S line appearance items such as unique front and rear bumpers, body-color sills and a rear diffuser. The S line treatment continues inside with stainless steel door sill inlays and 12.3-inch digital instrument cluster. The Premium Plus also adds parking sensors, active lane control and adaptive cruise control. The top-of-the-line Prestige trim builds on the Premium Plus to add a heads-up display, adaptive cruise control, heated rear seats, Audi Pre Sense accident mitigation, LED exterior lighting all around. The Audi A4 Allroad is the rugged sibling of the lineup, it comes with the standard all-wheel drive system but also is lifted and comes with increase cargo space. In wagon form, almost 60 cubic feet of cargo space becomes available compared to the sedan's 12 cubic feet. The increased cargo room makes it much more practical and allows Audi to compete with other popular active-lifestyle models such as the Subaru Outback and Volvo V60 Cross Country. The Audi S4 adds more aggressive styling with the iconic "S" trim specific accents and features. These features include sport bucket seats, 18-inch alloy wheels, lowered suspension and "S" specific materials. Standard safety features on all A4s include front, front-side and Sideguard head curtain airbags, antilock brakes with electronic brake-force distribution and brake assist, stability and traction controls and a tire-pressure monitor. Rear side airbags are optional across the lineup. Other safety equipment includes lane departure warning, Audi Pre Sense basic for forward collision mitigation and pedestrian detection prevention.