Thanks Alan L...your report is going to make a lot of us without ARS happy. My thoughts the same on the M550dx bar. 16mm is a tad over 10% roll stiffness. Maybe just enough to balance the effect of the new M5 bar without adversely affecting ride. Just curious...do you know what the M5 bar diameter is? Realoem didn't indicate the size.
BTW: You might of already heard this 1000 times...Your car looks GREAT!