The A6 represents a healthy blend of luxury, performance, and the practicality of AWD. The A6 offers a range of engine choices including V6, V8, and V10 engines. Although a FWD model is offered, most buyers should opt for the superb quattro AWD models. On the interior, you will find that the MMI system from Audi's flagship A8 appears as standard equipment. The exterior styling features a familiar roofline with a more substantial looking lower-body and the Audi family grille. The ultimate A6 is the S6 performance sedan. A 435 bhp V10 is teamed with a six-speed automatic. To get that power to the road, S6 is equipped with 265/35R19 tires and all-wheel-drive. Exterior upgrades on the S6 are minor -- few will suspect what lies under the hood.