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Originally Posted by withoutme
Quick question..
Can I use a 2005 STi AP for a 2004 STi?
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Not without a firmware change. You can send it to COBB for the switch.
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Originally Posted by withoutme
Also can protuned maps from the 05 AP be used on the 04?
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Too many variables involved with Protuned maps. A protune is geared towards a specific vehicle and it's operating characteristics.