It is certainly easier to just swap out the PCM on the '04 since that is all that there is to Stage 1. If you had an '03 the injectors would also be different and I am not sure how the stock PCM would fair with the unexpected larger injectors emission wise.
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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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