Just what is quattro and how does it work? With some help from precision driving expert Paul Swift and an Audi S5, Iwan Thomas finds out exactly what it can do.<br /><br /><br /><img src="http://ll.broadbandsports.com/images/38260_thumb.jpg" alt="Audi Quattro Test drive" title="Audi Quattro Test drive" width="150" height="90" alt="Audi Quattro Test drive"/>
