Audi's, S4 and the 2007 RS4, match up. In the canyons of Malibu to find out how their newest sport sedan compares to their best sport sedan.br br br img src="" alt="2010 Audi S4 vs. 2007 Audi RS4" title="2010 Audi S4 vs. 2007 Audi RS4" width="150" height="90" alt="2010 Audi S4 vs.