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 what the simplest of changes made the biggest power, but about 6-7 months later I started with the turbo rattles. Time slip in picture was only with the BMS cone filters and the JB4. It was also a green light start (explains the reaction time).