For the EX it's 3.5mm page 18 of manual.
I guess it might change how sway bar moves
Oh I wish I had the time to be on track and test
but unfortuntelly it's limited
For me without is safer, not faster
for example when hitting the curb wrongly with sway bars car becomes undriveble, without no problem. Maybe it's the track.
This Sunday I'll go to another track and check there some things I have in mind