H&R 2.5 inch ID Single Race Spring Length 14 inch Rate 375 lbs/inch 2009-infiniti-g37-esi6820794 a proprietary iron alloy developed

a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion

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H&R 2.5 inch ID Single Race Spring Length 14 inch Rate 375 lbs/inch 2009-infiniti-g37-esi6820794 a proprietary iron alloy developedH&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and