Originally Posted by ucsbwsr

1. Hard to quantify this but "a little." The difference isn't as drastic as on my 535xi that has servotronic. I also flushed the PS fluid which usually helps a bit so it's hard to decipher which what did what but overall the difference is small but positive.

2. My understanding is the DSC system uses wheel speed variation to detect slip and the threshold for that is ~1% or just above so the rule of thumb is to keep the F/R rolling diameters of the tires <1.0%. My Michelin PSSs have a difference of 0.617% so no worries there.