Take a look at this:
Roll Center Adjuster - Megan Racing Ball Joints
Megan Racing roll-center adapters are designed to correct suspension geometry after a car has been lowered. The uneven length of suspension arms causes toe adjustments to occur drastically during braking. Megan Racing roll-center adjusters make up for the travel in the suspenion arms to return suspension geometry to its correct starting point. This allows alignment and steering to remain more consistent and predictable during aggressive driving and competition.
http://www.gpiperformance.com/..._4051