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I have the front and rear speakers running off the head unit and an Alpine amp in the front powering the subs in the doors.
Just upgraded the software in the head unit so it's the same as the Pioneer 940BT as this has much better app support for the iphone. Also fitted a reverse camera and changed the dash speakers to Alpines.
I bought an ex demo head unit off ebay, by the time I sold the Porsche CDR23, disk changer & amp total installation was $300.
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