This is similar to our Level 5 axle except the outer CV is made from Billet Chromoly and the internals are also made from the same high-grade material. These Axles use the original spline size to fit the stock hubs. To make sure the center bar was up to the task of hard launches, autocross, and rally demands, we have decided to use the new 300M material. This material has proven to be without a doubt the strongest and most resilient bar material we have used to date. Also, we have recently changed the inner CV from a tripod design to a full ball and cage design with a larger radius to the spline plug for added strength. Thats it. the finished product is a  direct-fit axle that will withstand the most violent launches, time attacks, or rally applications. (ask about the road rally package that uses ultra high-grade grease and vented boots).