I believe they are responding to your post #2 in this thread, which references the only change being the M button. Indeed, we know have it confirmed that the software has been remapped for the 1M, along with the lighter flywheel. I'll agree with Roboto... I won't be seeking a tune for the motor for awhile....it's got plenty of power out of the box as I learn the limits of the chassis.
Lone Star BMW CCA Chapter Ex-president (retired 2017) , Chief Driving Instructor - LIFETIME Member # 119366
Past: 1991 BMW E30 M3 street car ; 1988 BMW E30 M3 track car