Quote Originally Posted by MGV View Post
XDL electronic differential lock? Sounds like it does what the guys that have put in the new Haldex controller are claiming... ?

Maybe the same thing?
When you push a car with XDL through a twisty road, you will end up with some really hot smelly brakes - this has been proven

XDL applies braking force to the inside front wheel to prevent understeer, however it comes at the expense of your brakes/pads. Whereas the Haldex upgrade actually pushes the power through to the rear wheels to overcome the understeer that way.

Handling-wise they will perform in a similar fashion, however from a wear and tear point of view the Haldex is probably still the better alternative. Though if the car comes with XDL I'm not sure you'd benefit from the Haldex upgrade unless you turned the XDL (traction control) off.