I was under the impression that I would be recieving a 11 button OBC computer in my BMW but when I picked it up it was a 7 button. Now I dont have the manual so I dont know what all exactly that it does but I am pretty sure the 11 button does more. Plus I prefer the look (the screen is longer) of the 11 button. If I were to get an 11 button would it be direct plug and play? BTW, what exactly does the 7 button do?