Bob and Mark install a Power Commander to custom map this Harley after a custom exhaust and air intake. They remove the battery and remove the battery box to properly install the Power Commander. Take your time and only cut the tie wraps that you have to. They have to level the relay box to install this PC since this model has a custom rear fender, check your model and install instructions. Battery back in and they use a little dielectric grease to install the PC plug into the ECM and back to the factory harness. Once the PC is in place they download a map to it for the custom set up from the computer.