Certain cars, especially those with MacStruts, benefit from stiffer sways in the front due to controlled camber-curves. I'm not so sure about the M, but my STI would keep more of it's negative camber by not leaning/compressing at turn-in and in-corner. The stiffer the bar...the more grip. Even if the ultimate grip is the same, the quicker transitional behavior and reaction of stiffer bars provide a better feel for performance driving.
"Arcadian, I've fought countless times, yet I've never met an adversary who could offer me what we Spartans call "A Beautiful Death." I can only hope, with all the world's warriors gathered against us, there might be one down there who's up to the task."Μολὼν λαβέ!!