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%...