[edwinm3]

OP doing what you're asking is completely throwing off the suspension and taking away from what makes these M cars so great, their handling, there are a lot of threads on suspension upgrades, balance, etc.
Not really sure where you got that Eibach makes the springs on our cars, I'm assuming that from the early pics showing the prototype M with eibach springs on, that was never confirmed though. BMW could've easily used different set ups at that time during testing.