I have my EDFC motors powered by the accessory power sources inside the car. My car is a G37 so there is some differences. In the front, I have to motor driver on top of the front left relay box. I have it mounted via zip ties and zip tie anchors as to not block the motor driver breather ports.
I ran power wire through the firewall and into the cabin where I tapped into a an accessory power line.
For the rear, I removed all the lining in the trunk and mounted the rear driver the same way as the front (zip ties and zip tie anchors). There is a lot of hollow space between the plastic liners and the body so this was perfect. There were many rubber grommets in the trunk so I just ran the motor lines through there to each motor. To power the motor driver, I ran a power line up along the trans tunnel hump to the accessory power source in the arm rest.
Be sure to mount your EDFC controller unit somewhere rigid because there is a G sensor in it.
Finally, get the GPS speed unit and don't even bother with the speed sensor wire. It's $75 bucks and saves a lot of time and headaches.
