My take on noxem explanation is that coding out NOx actually just hides it and doesn't remove all the logic and stuff from the DME, just hides the codes. In future when someone else comes along trying to figure out poor MPG or rough running or whatever there will be no codes so they'll presume NOx running correctly.
Just get noxem it'll pay for itself. I've had my n53 four years and it still amazes me how good the economy can be. I have it in 272ps form in an F10 and I don't hang about but at the end of a 44 mile trip last week, in traffic, it showed 39.something mpg and I certainly don't drive like miss daisy.
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