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Alternator part # is 23700-AA280 for the 1999 Impreza WRX/STI.But as RedndWhite mentioned, It is extremely cold outside so a difficult start is to be expected. You can take the battery out and get it tested at any Auto Value for free. Your best bet for a smooth and reliable start in cold temperatures is installing a block heater. The part # is A0910-AS100.- BTG