Revshift polyurethane differential bushings completely replace the oem rubber bushings on the E46 M3 and Z4M. These bushings stiffen the differential improving the vehicles handling capabilities. Will not wear out like oem bushings Properly dampens the differential Includes new class 10.9 bolts Revshift bushing lube included Improves handing Lifetime warranty Sold as a set Hardness80A Street (Black): Slightly stiffer and stronger than OEM rubber. No increase in NVH. Great choice as an upgraded stock replacement (OEM+).95A Track (Green): Significantly stiffer and stronger than OEM rubber. Noticeable increase in NVH. Excellent for enthusiastically driven street and track cars.75D Drift (Teal): Drastically stiffer and stronger than OEM rubber. Moderate increase in NVH. Most commonly used on dedicated drift and track cars.(NVH = noise, vibration, harmonics)Learn more about choosing polyurethane here: https://revshift.com/pages/polyurethane Please specify the hardness
