Whiteline Front Roll Center Adjustment Kit - 2008+ Subaru WRX | STI
If you have lowered your vehicle then you may want to consider getting the Whiteline Front Roll Center Adjustment kit. The Roll Center Kit incorporates 2 steering arm tie rod ends, and 2 ball joints, and is designed to raise the front roll-center geometry after lowering the vehicle. This will also improve on the original bump-steer geometry.
How it works is that the Whiteline ball joints are physically longer compared to the OEM units. Once installed into the control arm, it will push the control arm down to keep the factory suspension geometry settings as close to OEM as possible.
The Tie Rod Ends are also taller when compared to OEM. They come with heady duty boot covers for heat resistance near the brake rotors. These are a must-have if you lower your car, however they make for really good factory replacements. They come ready to install with new castle nuts, and new pins as well.