H&R 60mm ID Single Race Spring Length 100mm Spring Rate 120 N/mm or 685 lbs/inch - RF100120 fits_2008-2014`Mercedes-Benz`C-Class Valves Open – Exhaust gases

Valves Open – Exhaust gases flow unrestricted through a large X-pipe

Material: Premium T304 stainless steel for maximum durability and corrosion resistance

FRONT REAR SPRING RATES 5k 4k UPPER MOUNT Hardened Rubber OR

530i & 535i models are equipped with 8k F spring rates

Hose-End 10

H&R 60mm ID Single Race Spring Length 100mm Spring Rate 120 N/mm or 685 lbs/inch - RF100120 fits_2008-2014`Mercedes-Benz`C-Class Valves Open – Exhaust gasesH&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