H&R 2.5 inch ID Single Race Spring Length 10 inch Rate 750 lbs/inch - R25100750 fits_2015-2020`BMW`4 Series Large Five Layer Performance Air

Large Five Layer Performance Air Filter: This 360-degree radial flow air filter features our pre-oiled Pro 5R media with five layers of progressively finer cotton gauze media for maximum performance

Mishimoto -AN Vice Jaws feature a durable anodized finish to prevent corrosion and include our signature Mishimoto Lifetime Warranty

A custom CAD designed roto-molded housing made high quality plastic eliminates the use of multiple components and ensures the coolest air intake charge available

Fits 4 & 6 & 8 Cylinder Models

H&R 2.5 inch ID Single Race Spring Length 10 inch Rate 750 lbs/inch - R25100750 fits_2015-2020`BMW`4 Series Large Five Layer Performance AirH&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