These kits use 350# front and 500# rear springs. This calibration has more grip, and is intended for use with “performance” alignment settings and sticky tires. If ride quality is a major concern, don?t go here because the stiffer rear springs make for an uncomfortable (choppy) highway ride. This is a more balanced and less forgiving setup intended for enthusiast track days and autocross events. This kit will also launch well for mild drag applications. Expect a huge improvement in handling capability. This would also be a great low-budget setup for new (road racing) drivers going to a (track) driving school.
For the sake of comparison, typical OEM spring rates for these applications are approximately 220#/in front, and 110#/in rear. With the numerous Civic & Integra applications, there is a range of spring rates, and these CS-II systems are significant upgrades from your OEM damper and spring calibrations.