Anybody have this setup on their M5? I know a lot of track/race guys like this set up (height adjustable springs), but concerned it may be too stiff for everyday street use. Spoke with Jay (finally) and his coil over set-up uses Eibach 'RACE' Springs'. Even with Koni's set to low, I'm thinking this will still be too stiff (vs. Eibach Pro-Kit Springs) for daily driving (with passengers). Thoughts?