Anyone have any experience with the OBX LSD on their r53 6speed?

 

I have only seen one installed in a car personally and we had to replace it since it kept spitting out the drivers side axle.
Customer was told by prior installer that they are pretty solid units once you clean up all the casting lines they leave and replace all the hardware that breaks.
Kind of a gamble for the amount of work it takes to swap it out but there are people who have no issues with them.

 

Give the Ford SVT diff a look also.

http://fordracingpartsbydonwood.com/driveline-parts/differentials/svt-focus-torsen-m-4204-svtf/

Mine has been working great on and off track for over a year now, about 25k miles
Drops in with no mods.