Fortin is making a sprag gear for the drive shaft on an X3, which allows the front wheels to coast under off throttle moments. I can see it assisting with brake bias like they claim on their website, and would presume it would take some of the wear and tear off the front diff under braking as the rear end isn't trying to force the wheels to rotate. Anyone have any experience with using one? Has it increased front diff life? It's pricey, would have to significantly increase diff life for me to drop the money.