1) Spring rates for Eibach Pro-kit Eibach NA (US 4S) Turbo (US 2S) Progressive Front 171/314 lb 185/250 lb Rear 142/228 lb 145/200 lbcompared to stock Nissan Front 3.0kg/mm (168 lb) US 2S & 4S NA 2.8kg/mm (157 lb) AUS 4S NA 2.8kg/mm (156 lb) US TT 2.6kg/mm (146 lb) EURO 4S TT Rear 2.2kg/mm (123 lb) US 2S & 4S NA 2.2kg/mm (123 lb) AUS 4S NA 2.4kg/mm (134 lb) US TT 2.6kg/mm (146 lb) EURO 4S TT 2) Coz sells the entire kit. 3) Tein sells a "comfort" coilover that has a mono-tube design. The KYB/Eibach combo is still a bit harsh, but obviously more comfortable than your SS's. 4) Eibach is progressive all around, while the H-Techs have a linear spring rate with a progressive spring design. The Eibachs would be more comfortable theoretically.
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