Is the fuel map already corrected for the extra amount of fresh air that is pumped into the exhaust track? Isn't the o2 sensor getting a false reading just like you would on a dyno if the AIS isn't blocked off? What happens when you install the block off plates? Will the o2 sensor now get an accurate reading?
I know it's a lot of questions, but I was just trying to best describe what's going through my head. :screwy