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I know Cobb has AP for STI and Forester Specific. So do SG owners really need an 04 STI ECU (with other suppporting sti mods) if you can flash your ECU with the COBB AP with the Forester specific AP? And if you do have an STI ECU I'm assuming you would need the STI specific AP?
 

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2013 WRX Limited Manual
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563 Posts
I am definitely not 100%, but fairly certain. If you have an 04 Forester XT, you can plug in the STI ECU if you have the STI Turbo, Intercooler etc. If you want to change the maps, you would need the Cobb AP. The STI ECU is only if you want to stay at the STI stock tune.
 
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