Condor Speed Shop - "SHORT" Engine Mount Set (SPEC E46) - E46 & Z4Our solid UHMW mounts have been designed with one thing in mind To increase on track performance by lowering the center of gravity in your BMW. Our mounts will lower the M54 engine by a full 10mm. This is the max allowable amount per the Spec E46 rulebook making these legal for the NASA racing class. This modification moves the weight down low in the chassis, dramatically improving handling and grip and increasing the responsiveness of your race car.