How to further enhance the driving experience of an already unique roadster. Bulk up the engine, make it even more streamlined and add some additional aural value to it. That or similar was the thought of BMW’s engineers as they conceived the 2011 Z4 sDrive35is. The roadster that definitely will leave an indelible imprint on its era, has been spent a twin turbocharged 3.0-liter straight six mated to a seven-speed dual clutch transmission, which produces 335 horsepower with a torque up to 332 pound-feet, allowing for a 4.7 seconds short sprint to 60mph. Alongside few aerodynamic enhancements, the new Z4 comes with revised suspension and exhaust for a more direct driving experience followed by a surprising deep roar.