H&R 2.5 inch ID Single Race Spring Length 12 inch Rate 450 lbs/inch - R25120450 fits_2012-2017`BMW`650i With up to a 39%

With up to a 39% increase in flow over stock

Right side applications

CNC machined components are made to the strictest tolerances

and a 10-percent efficiency increase

Order your Red Alpha Expansion Tank today

H&R 2.5 inch ID Single Race Spring Length 12 inch Rate 450 lbs/inch - R25120450 fits_2012-2017`BMW`650i With up to a 39%H&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