These axles feature a direct fit outer CV that will fit the factory hubs and is made from a special proprietary material that is designed for high horsepower applications. The axle bars are made from a high grade aircraft quality material that is much more torsional than the factory axle bars, allowing them to twist and absorb shock loads, with a spline size that is significantly larger than stock. The inner CV is a108mm Porsche-type CV, with our proprietary cage and race set that is used on our highest level axles.