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  1. 2.5 Liter/Litre Factory Motor
    Hi guys, I have browsed through iwsti and nasioc for hours but could not find anything that was similar to my situation. I have a 13 GRF STI with a stock EJ257. I just added a Q300 catback and now my AF Learning is insanely negative compared to before the catback. It sits around -1.3% to -2%...
    af learning af learning issue negative af learning
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