I just got my new EZ tonight and tried to move the jumpers over to level 6. When I took it out for a test drive, the truck performed like it had no box at all on it. I came home and put it on level four and took it for a drive. There was a major improvement. I then picked up the phone and called edge products. Justin told me that most of the newer boxes have had the program removed for levels 5 and 6. They said that they do not advise the use of those levels. I wish I would have at least have had the opportunity to make my own decision. :-{} I feel like they pulled the chain on it. I understand that they never mention those levels in their advertisements, but after hearing about it I was looking forward to it.