Well, John asked me if I'd do a build log on here and I said I'd give it a shot.  So here is my college try. I purchased a 2009 335xi AT about 2 years ago and originally had no plans of modding it, but funny how that always changes.  Seriously though I had no idea what engine the car had or anything when I got it, but after some research the wheels started turning.  Like everyone here I started out with the basic "Tune" for the N54 (JB4 G5 ISO).  I was amazed at w