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I would like some assistance in my quest to install a truly integrated car phone kit in my 2000 Infiniti Q45. I want it to integrate with my current car speakers.

Does anyone have any ideas as to how I determine if it is even possible and then how to go about it after that?

I have been offered an option that uses a car kit speaker and mutes the car speakers, but I want the sound to come through the car speakers. Am I asking too much if it is not already part of the car's design?

Thanks