Significantly better over the OEM base.
Can't comment on Sportline/M sport line, but I assume 30-40% stiffer?
This isn't as stiff as an Mitsu Evo.
Note it'll drop a little more in the front as I continue to drive....
some artsty fartsty angle shot too (it's too damn cold out for anymore, I'll post more end of week when I've put on a few more hundred miles).