iminhell1: I am not talking about the charge pipe -- just the intake. Like this one: (
https://afepower.com/afe-power-54-11...-intake-system). Meth bungs are on the charge pipe.
juld0zer: You are right -- there are a number of discussions from around 2011 on e90post. However, they do not causally link the cold air intake to high fuel trim and lean condition. Also, because I bought the car with the intake already installed and did not have any problems for a year, I did not know that the intake was responsible. So I kind-of arrived at the whole thing from the opposite direction compared to most people, if that makes sense...