To save your self some headaches, you might want to get one of these: http://www.monoprice.com/products/pr...seq=1&format=2
They have a 2 usb model as well from griffin: http://www.amazon.com/Griffin-Powerj...uct/B0042B9U8Q
. I have the griffin one and it works great for charging my phone while having another port open for a passenger.
2011 335D Space Grey, Black Leather Interior, ZSP, ZPP, ZCW, 6FL, Satellite Radio, Nav, Base Audio