RB, the adaption of the ECU, is what I thought. so not as much fun by the CAI addition anymore ;(.
I'm debating on spending the $800 CAD to get that Software Level 2 installed... but I already have my vehicle tuned and the Dinan software will overwrite that...

before the ECU adapted the exhaust note was different and has since quietened down again. Not a bad thing, but just a second thing I noticed with the lack of new acceleration feel.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S