On this episode of Ignition, Carlos Lago heads back to Fontana and the mountainous roads of Angeles Crest Highway to tackle the newest update to the Audi S4, the considerably faster and more aggressive version of the popular A4 sedan. The 2013 Audi S4 is just as precise but with much more attitude and when equipped with the Sport Differential, the all-wheel-drive sedan rotates almost like one of its rear-wheel drive counterparts. Will the new Audi S4's V6T engine reign supreme over the previous generation's V8? Will people even be able to tell the difference between the S4 and that A4? Stay tuned to find out.