this is what it says on that webpage..
"After the installation of either an Eibach Pro-Kit or Sportline spring set, a vehicle's alignment should always be checked. Once lowered, a wheel's camber may become "increasingly negative", meaning the top of the tire is angled inward (toward the center of the vehicle). While some "negative" camber aids in improving traction and road adhesion, too much can result in peculiar handling and accelerated tire wear.
Eibach offers a complete range of alignment kits which offer a simple, affordable solution to adjust "negative camber". These alignment kits not only assist in adjusting a vehicle's camber back to factory specifications but they also allow the experienced chassis tuner to utilize the increased adjustment range to "dial-in" a Performance alignment that uses negative camber to maximize a chassis' potential. Turn-in becomes more precise and handling increasingly crisp and predictable. High-speed stability is also enhanced making an alignment kit from Eibach almost a necessity for the serious Performance tuner."