Heavy-Duty Gear Selector SpringsIncreased thickness and preload over OEM parts 82% stiffer spring rate than stock. Stronger springs offer faster shifter centering 10+ years of race testing Suitable for all cars (street and race) Our heavy duty gear selector springs offer an increase in the preload and 82% stiffer spring rate over the factory parts which aids in ""centering"" the gear selector and shifter. Upgrading these springs will make your gear changes a bit sharper since they