![M140i Wavetrac M140I Wavetrac Install](http://www.regalautosport.com/blog/wp-content/uploads/2019/11/DSC07717_-M140i-Wavetrac-LSD-Upgrade-12-1024x576.jpg)
The Single Best M140i Upgrade?
Straight from the factory, the M140i is an incredible package. With an engine producing around 335hp and 500nm which is matched to a fast-shifting ZF 8-Speed Auto the performance credentials are strong, but one of the MAJOR drawbacks of the M140i, which is passed onto the M140i is the open differential.