Designed, developed and tested on our 996 GT3 WC street car, the World Challenge anti-roll bar features front and rear hollow tube anti-roll bars that are 5 way front and 4 way rear adjustable. The rear bar offers an increase in stiffness from 20 to 80 percent over the stock bar and the front bar offers an increase of 10-50 percent increase over the stock front sway bar. Complimented by urethane bushings these bars are a must have for anyone who is tracking their GT3 / RS or racing the 996GT3 CUP and simply wants to reduce the "push" that these cars exhibit during spirited driving and track use. The GMG WC anti-roll bar kit is sold as a complete kit and is a true bolt on upgrade that requires no modifications to your vehicle and works with the standard sway bar drop links and dampers or any after market damper such as Moton , JRZ or Ohlins