MR-3438 is an OES Front magnetic ride strut for the 2007-2010 Cadillac STS (GMX295 Platform) with Rear Wheel Drive (RWD) equipped with the GM magnetorheological damper system (Z95 RPO). This magnetically controlled strut 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 iron particles that are easily magnetized. The damper includes two electromagnetic coils which, when turned on, instantly change the bonds between the magnetized iron particles to alter the viscosity and stiffness of the suspension. Arnott's universal Magnetic Ride Cadillac STS front strut, which fits the left or right side, connects to the vehicle's ECU with no modifications.