There is a power port in the front passenger foot well - I connected my V1 and concealed the cord - not perfect as you have to turn the V1 on and off!
09 E90 ///M3 SS | Black | Modded
13 Cayenne GTS Carmine Red
15 F82 ///M4 SS | SO | CCB's | Loaded | BBS FI's | Eisenmann | K&W | M Performance
15 991 GT3 | Rhodium Silver | PCCB | LWB