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Hello. My friend has a 2004 Z4 BMW. Its had a Parrot system fitted and he wants to remove it. Ive taken a look at it and it has the buisness stereo fitted as standard and In the door cards there are speaker grills there but no sound comes out of them. Ive noticed on the car wiring harness the quadlock is fully populated. Is it posible that the car could be fitted with an upgraded system ? Any help would be most appreciated. Many thanks Dave.

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