I have recently installed the JB4 on my 2007 BMW 335I and I dowloaded and followed all the steps. I guess I am upset because in my box they should have included all the instructions for my particular vehicle, which it didn't, but to refer me to their website to watch the video and download all the paperwork. So I wasnt happy about that at all. The next big issue is I installed everything correct and to be honest the car when you hammer on it just acts like it has a engine misfire and throws a check engine light. So I took everything back apart thinking I did something wrong, but I found nothing.. So I sent a email over to BURGER MOTORSPORTS and they did send back a response but they didnt seem to answer any of the issues. I did not know anything about the whole mapping sequence you can do from the buttons on your steering wheel and I asked about what that was all about and what to do to tune it right. My car yes has more power but it acts like it doesnt get full power when you run it up hard. ANY HELP PLEASE?