I know for a fact that if i bolt on a big sway in the rear it will SNAP the weld off the sway bar mounts if i don't run springs over 250 to 300 lbs.

to me higher spring rates make sense because the more speed you add to a turn (like long sweepers on a road race track) the more g forces will increase.

when i bolted the H&R race springs to my old car that sucker handled down back roads in SC at highway speeds.