M Performance LSD (F2X M135i/M235i Manual/Auto, M140i/M240i Manual)
BMW M Performance Limited Slip Differential. Fits auto and manual M135i/M235i, as well as M140i/M24oi manual transmissions only.
The biggest drawback of these cars are their lack of limited slip differential, meaning that getting power to the ground effectively is hugely frustrating. However this can be fixed, with a BMW Performance Limited-Slip Differential.
Genuine BMW part. 3.08 final drive.
Available on back-order