Audi S4 Cabriolet – Review: When empty roads and bright blue skies beckon, few machines are more appropriate for a road trip than a performance-tuned, luxury-lined convertible. Fortuitous it was that we snagged the keys to the updated 2007 Audi S4 Cabriolet during a rare February heat wave in California; that we had a long holiday weekend with nothing better to do than drive Highway 58, which cuts across a third of the state from Bakersfield to Santa Margarita; and that the rest of the nation was frozen in winter’s icy grip while we dropped the top and blasted along freshly paved two-lane roads. Days like that make you glad to be alive, living in California, and driving the impressive Audi S4.