This kit is right at home on the race track while providing borderline usage for the street. The upgrades over the Stage 1 Kit are the beefier 150 lb. or 160 lb. rate springs and the racing shackle kit with Del-a-lum bushings. Both of these components add a stiffer, more positive ride. Stage 2 rear suspension, road race for '65/66 with 2-3/8" stepped down rear with competition shackle.