Originally Posted by e39_touring

Yes, it's very easy if you're somewhat familiar with inpa/winkfp, etc. It's been a while, but if you have questions, post them up here, and I can walk you through it. There are lots of videos online as the process is the same for the e46, and a lot of those guys run the eu2 tune. The only difference is you have to select the calibration suitable to the euro version of your x.