This thread is super helpful and informative! I have been looking at the VF centrifugal kit for my 2002 330i but wasn't sure if it was worth the cost. I have just a few questions for you: 1. did you install the kit your self, and how difficult was it? 2. VF says that it is completely bolt on is that true or is there any modification that you have to do? And 3. one sit said that the kit came with new software, but if I remember what I read in the earlier posts, you said that you used a different software. I was wondering what software you used and why?