This is a Machined Aluminum Reinforced Differential Crossmember for Nissan R200 equipped 240Z 260Z and 280Z.
This crossmember allows the use of the aluminum finned large capacity differential covers from ESCORT. As can be seen in the photos, the expanded area clears the crossmember perfectly. Complete with urethane bushings around the diff mounts and solid bushings to mount to the body.
ESCORT recommends these for cars over 250HP. Due to the suspension geometry, large amounts of power encourages the rear control arms to want to move laterally away from the differential. Due to having 6 mounting points to the unibody, lateral motion is kept to a minimum so the power goes where it should.
Silver, Gold and Black finishes are available.