This is one of the most cost-effective ways to improve track and overall car performance and handling you can make for the price.
Street/Track anti-sway bar (anti-rollbar) for Lotus Elise and Exige is stiffer than stock sway bar and is a must-have for those running R-compounds. Comes with stiffer polyurethane bushings and adjustable heim-jointed end-link kit with 5 adjustment points. Using top grade rod ends and hardware, the adjustable end-links use right hand and left hand thread for easy adjustment. This is the bar for 95% of Lotus Owners!
Ultralight SCCA SuperStock: Adjust from about 2x stiffer than stock to 3.5x stiffer. This superstiff setting is specifically used for SuperStock SCCA competition where front camber is limited and spring rates are soft. By using this bar with adjustable shocks, effective spring rates can be raised to significantly improve transitional response. Additionally, the front roll is minimized improving the effectiveness of the minimal front camber. In National level Super-Stock that additional low-speed push is a good trade off for superior transitional response.