The Sound System — Where You Can Hear Your Money
A standard Road Glide radio is built to sound nice in the garage. It won't hold up at 130 km/h with the wind in your helmet. That's why the entire audio chain has been replaced: a new head unit with CarPlay, speakers in both the fairing and saddlebags, an external amplifier with its own wiring harness, and a subwoofer that brings back the bass.
A 2023.5 isn't just a 2023 with a new model year. Harley changed the fairing, wiring harness, and the entire infotainment platform in the middle of the model year, so audio parts from the 2015-2023 generation won't fit directly. This is the most important thing to clarify before you buy.