Buyers can swap out the standard gray birch interior with carbon fiber inlays for $500, have the entire interior swathed in leather for $4,900, add a solar roof panel for $790, give rear passengers power adjustments for $350, or drop $2,100 on intelligent cruise control. There's also a $3,500 Premium Package that adds rear sunshades, power trunk and door closers, a park-aid system, a rear heated seat, and keyless ignition. But what Audi is most proud of is the Bang & Olufsen audio system. In exchange for $6,300, audiophiles are treated to 1100 watts of surround sound and tweeters that rise from the top corners of the dash.