The 2014 BMW Z4 Life Cycle Impulse at the 2013 Detroit Autoshow. The differences to the outgoing model is subtle, The new LED Corona rings the BMW lettering on the LED lines on top, the new surround for the side indicators and fresh 17 and 18-inch alloys and in the interior, deep gloss black surrounds for the air vents and the iDrive display. (Have a look at the gallery and video after the jump)