my 535i can't run stage 2 but i am running the N55 Terry told me that there isn't jb4 stage 1 they just sent me a new box maked N55. I am running it now and running 3.0 over boost, seem to running better at that setting in my 6MT. Once in awhile I do get a drive train malfuntion
not sure why or if it the tune. I turn off my car and restart everything is fine. When i ran my boost at 4.5 it seem to casue more lag when i shift from first to second not feeling that now at 3.0