just use 2 rolls at once, start from the front and work ur way back to the amp, then do the rear doors and work ur way back, leave about 3ft of extra slack at the amp and 3 ft in the doors, u can always zip tie it out the way, why i said 3ft of slack is because during upgrades, u can have extra wire to use and not need to splice. if u also have an aftermarket alarm, i would go ahead and run 2 pairs of 14gauge wires per door, to the window motors, this is for the 530t, window mod. its just a suggestion if u want auto up and down on all windows with alarm system. good luck and get some silicone spray, easy to fish the wire thru doors.