On all of our plug and play kits for 14 and up Harley Davidson Infotainment system the radio MUST be flashed, 4 speakers no amplifier. This flash will turn on the rear outs on your radio, as well as set the internal EQ to a Flat safety level for us to build a distortion free system. If your dealer will not flash for you, please send us your radio and we will Flash it and send back to you, at no additional cost.