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I don't have hands on experience with audio in an 03, but I believe the stock audio systems in those cars transfer data using an optical system. So, the amplifier would work with optical inputs only. Unless your Alpine unit is also optically based, it would probably be incompatible with the stock amp.
I don't know whether there are adapters available to make the units compatible. My guess is that it would be less expensive to buy a new amp that is compatible with your Alpine.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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