The onslaught of aftermarket S5 Sportback tunings have started, and this one from Senner Tuning AG is a really good start! Senner starts by upping the output from the S5's 3.0-liter supercharged V6 to 375 horsepower and 365 pound-feet of torque – gains of 42 and 41, respectively. From there, the car is painted in a special diamond black finish, and new 20-inch wheels have been added, wrapped in 245/30-series rubber up front and 295/25 low-profile treads out back. The interior gets the standard carbon fiber trim upgrades, and the whole package is super stealth. Source: Senner AG