I'm not really sure...
All I know is that it eats wheel bearings like mad.
I've replaced the NSF wheel bearing 3 times this year - If I'd done it as soon as it needs doing I'd have needed a new one every couple of weeks.
I think my ball joint is out as well, but basically... Under acceleration the car lurches to the right and the NSF wheel has negative camber, which is wearing the tyres out like nobody's business.
Apparently the hub is worn, so that it's not holding the bearing in tight enough.