Looks like diff bushing reinforcement and/or NVH damper. Workshop manual yields nothing on it, but the bolts that hold the diff housing run through it. Haven't seen them on S550's, so must be an S650 "upgrade."
Looks like diff bushing reinforcement and/or NVH damper. Workshop manual yields nothing on it, but the bolts that hold the diff housing run through it. Haven't seen them on S550's, so must be an S650 "upgrade."