This is the all new Scion XB and XA Level 3.9 Axle/Hub set designed for 500Hp.This set starts with a standard size spline going into the diff (made from killer strong 300M) so aftermarket limited slips are no problem, we then went on to make the center bars 25% larger and more torsional so the launch stress is taken up slowly. Now the factory outer C.V. was just too small to really do anything with so we used our chromoly 26 spline from our other 3.9 series axles. We then made a custom hub to fit the wheel end, The hub is the same in brake size and offset so all your brakes and wheels will fit the same, it just has a larger spline thru it. This is the only level axle set we will be making for the XB/XA so when your ready there here for you.