Swift Springs Spec R 00-09 Honda S2000 Infiniti G37 Coupe AWD (09-15) This spring is ground on

This spring is ground on one end and "Pig Tailed" on the opposing end

Swift coilover springs

This enables the load on the spring to be more evenly distributed easing the pre-load and reducing the noise created under spring compression

The following information is from Sparco's website

Swift Springs Spec R 00-09 Honda S2000 Infiniti G37 Coupe AWD (09-15) This spring is ground onSpring Rate F 7. 5 kg mm (419lbs in) R 7 kg mm (391lbs in) Lowers F 30mm (1. 2 inches) R 30mm (1. 2 inches) Built for track duty, Swift Spec R springs are designed at the upper limits of the OEM shock valving. Track tested and tuned for optimum performance yet comfortable enough for a daily driver. Keeps the quality ride you get from the showroom, and adds improved handling and lower ride height for driving enthusiasts and style minded drivers who