so whats the verdict on this mod
i have heard almost every positive and negative to this mod
1) will it throw an engine light?
2) do you need to do both lines?
3) will it hurt / hinder performance?
4) are there any negative effects to this?
all these posts and no definate answers. 1/2 say its ok and 1/2 say dont do it. i want to do it just to see the sound, but dont want to if any of the above will happen
can a real tech please answer this once and for all
2011 E90 AW
2010 E550 4 Matic