The Eibach ERS 3.75" I.D. with a 20-inch length and 300 lbs/inch spring rate is a versatile external reservoir coil spring designed for high-performance suspension systems. Featuring a 3.75-inch inside diameter and a length of 20 inches, this spring provides precise support and stability for a range of custom applications. Its moderate spring rate of 300 lbs/inch makes it suitable for street, track, or off-road use, delivering a balanced combination of comfort and performance. The spring's durable construction ensures consistent damping and support, with a focus on heat dissipation and long-term reliability. Weighing approximately 10.47 kg, this component is engineered for enthusiasts seeking a reliable upgrade to improve handling and ride quality across various vehicle setups.

Compatible with a wide array of vehicles requiring a 20-inch coil spring with a 3.75-inch inside diameter, this Eibach ERS spring is ideal for custom suspension builds, coilover conversions, or performance upgrades. Its universal fitment allows for flexible application across different makes and models, provided the specifications match. Installation involves replacing existing springs or integrating into coilover assemblies, offering a straightforward upgrade for those looking to enhance vehicle stability and responsiveness. Whether for daily driving, spirited street use, or track days, this spring provides consistent support and improved handling characteristics, making it a valuable component for performance-focused automotive projects.