Too bad you didn't read farther. Then you'd know the answer to your question is yes. And for the same reason the booster plugs' effect is negated. If your new exhaust does lean the mixture (the ECU can only "see" this at part throttle where the narrow band O2 sensors work and the ECU maintains a 14.7 mix so the convertor works) the ECU will adjust (trim) to get back to 14.7 and then apply the correction outside of that area. It won't optimize, it can only add or subtract across the board.Yeah, I started reading that thread, but seeing as it is about a different engine, with a different EMS, I really couldn't be arsed. With all the folks on here sporting decat headers I hoped someone would have a dyno plot with AFRs.
But hey, you seem convinced the EMS adapts to an IAT spoofer, so would it not adapt to a less restrictive exhaust?
The Motronic used the same basic logic. They have since they got O2 sensors. The BMS-KP and the BMS-MP are just more powerful and more sophisticated and the BMS-MP has a lot more checks to keep people from fooling it.
Too bad you "really couldn't be arsed". You might have learned something.