Which tech upgrades are worth making to your car's old sound system?

You can upgrade an older car with modern tech to enable Bluetooth, CarPlay and more. Your options depend on your car and what you need most.

You can upgrade an older car with modern tech to enable Bluetooth, CarPlay and more. Your options depend on your car and what you need most.<p><img src="https://www.engadget.com/img/gallery/which-tech-upgrades-are-worth-making-to-your-cars-old-sound-system/intro-1789407214.jpg" /></p>