hello everyone. this is my first post )). few days ago i replace headers and add lambda spacers (90 degree see pic below) in post o2 sensors on my 02 m3 smg from usa. when i done car start without any problem no SES light. after about 100 miles my SES light come up i think this is post o2 sensor warning .what i can do ? in my country no one can do ecu remap to delete pre os sensors is there any other way ? i dont want to pass emission. i heard about Shark Injector (programmed for headers, no cats) but it is expensive 350$$ ))) and os simulators 40$ what is the best way to do this. thanks.