Our friends over at APR just finished the 3 month long preparation of their 2010 S4 for the 2010 Continental Tire Sports Car Challenge. In fact the car is going to the track for testing this week. The following video shows the APR Motorsport Audi B8 S4 3.0 TFSI Supercharged against the same vehicle in completely stock form. More vids and pics to come from testing this week! In fact, APR is inviting you to Daytona to come watch it in person if you are able to! ENJOY!