This kit seems to be good reviewed in Europe for those who have it.
It's more stiffer than the M sport suspension, but if you want to slightly increase the stiffness of your car for tracking (for example), you need to go with coils ...
I think this B12 kit and some other suspension stuff like anti-roll bar, front arm kit and why not stiffer bushings will transform your car and allow you to track it alot
