A:AnswerYou can use Bluetooth to make a phone call or play music, but if you want to use full Apple CarPlay with maps, apps, etc. you must use USB. The data back-and-forth and the integration uses USB and not just Bluetooth.
A:AnswerYes you pay more the harness wiring , outer frame depending on the make and model year of your car . Not sure about xm antenna , I would assume yes