Xray X4 nickel coated brass weights
From Xray come these CNC-machined nickel coated brass weights specially designed for the X4. Mounted straight onto the motor mount in 3 spots, adding the weights to the motor mount wont compromise chassis space or flex. The weights are secured using 2.5x8mm screws and are added to the middle of the car which ensures no effect on the front to rear weight bias.
Source: Xray [teamxray.com]