MR-3851 is an OES rear magnetic shock for the 2015-2020 Audi A3/S3 (8V) including Hybrids. This universal shock fits both the right and the left side of the Audi A3/S3. The magnetically controlled shock from Arnott provides the same highly adaptive ride as the OE. The monotube damper is filled with magnetorheological fluid which is a synthetic hydrocarbon oil that contains easily magnetized iron particles. The two electromagnetic coils inside the damper instantly change the bonds between the magnetized iron particles altering the viscosity and stiffness of the suspension when turned on. Arnott's new universal magnetic ride Audi rear shock fits the left or right side and connects to the vehicles ECU with no modifications.