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Dosent look like anything from the factory.
If your certain your car never had any type of alarm in its lifetime, i would say it may be some kind of antenna booster. Who knows.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
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