The S5 is built with a 354-hp 4.2-liter V8 engine, mated to either a six-speed manual transmission or a six-speed automatic with Tiptronic and paddle shifters. Audi's quattro all-wheel drive system is standard, along with exclusive S5-specific standard features such as a sport-tuned suspension, bi-xenon headlights, 19-inch alloy wheels, heated front sport seats and aluminum interior trim elements. Options include a Bang & Olufsen audio system, voice-activated navigation, adaptive cruise control and Audi Side Assist. For 2009, the Audi S5 carries over with minor standard equipment and option adjustments. An auxiliary input jack is now standard, and the new Audi Drive Select package includes an adaptive suspension and dynamic steering system.