In the age of downsizing, Audi appears to be bucking the trend with its next-generation RS5. Prototypes of the hot sedan (technically a five-door liftback) and wagon were spotted at the Nürburgring, making sweet engine noise. The sound we hear definitely comes from something with more than four cylinders. Our money is on a V-6, likely a plug-in hybrid to comply with stricter emissions regulations.
