Whether HID projector headlights are plug-and-play can depend on various factors. In some cases, HIDprojector headlights may indeed be plug-and-play, meaning you can simply remove the old headlights and install the new HID projector headlights without any modification or additional wiring. However, this isn't universally true for all vehicles and HIDprojector kits.
Some vehicles may require additional wiring or adapters to properly install HID projector headlights. Additionally, HID systems may require ballasts and igniters, which may need to be integrated into the vehicle's electrical system.
It's always best to consult the manufacturer's instructions or seek advice from a professional mechanic or automotive expert to ensure compatibility and proper installation.