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That's not a big deal to upgrade the factory car radio system with aftermarket multimedia system instead nowadays. It's much cheaper and functional than the factory unit. That's why more and more people prefer to upgrade it with an aftermarket one. The DVD navigation system available for cars including BMW, Mercedes-Benz, Toyota, Volkswagen, Hyundai, Mazda, Suzuki, etc. Nearly all car models can be installed with one specific unit.