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I get the impression that the OEM unit is easier to install but the volume levels match the radio better on the Vais Tech unit. Am I correct?
A few Lexus dealerships use our XM unit for installation because it's easier for them to get behind the radio to install our unit then take a lot more apart for OEM installation. But for some cars there is a connector in the trunk which allows OEM unit to be connected within minutes.
You can contact your dealer to see where XM unit is installed in your car.