There are differences in the way the Air Conditioner and fan relays are controlled on the '04 which forces a change in the Stage 1 PCM. Using the '03 Stage 1 PCM will work but your air conditioner will not work.
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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