304230 / 304230 - Application Notes While it did not take long for the 2002-2005 Nissan Altima to impress anyone who drove it, what the car possessed in all-out quick, it lacked in smart handling. STILLEN, famous for their Nissan tuning abilities, developed a way to help keep the spirited Altima glued to the road with their bolt on Sway Bar. The stock sway bar is hollow, as is the STILLEN component, the difference being the thickness of the tubing walls. The Nissan unit uses rather thin-walled tubing, creating a sway bar prone to flexing more than average under pressure. Stillen thickened the walls and slighty increased the overall bar diameter, to create a stronger, stiffer bar better able to keep the Altima from leaning back and forth in the curves and corners.