This is the 900HP Axle/Hub Kit for the 2003-2004 Ford Mustang Cobra. The outer CV is our 40% larger Pro-Level 33 spline outer , along with 300M center bars and the kit includes hubs to accommodate for the larger spline. These axles will require the use of your stock inner CV from the factory Cobra axle and includes the boot clamps and grease to install them with. Designed to handle up to 900HP at the wheels. Rated to 900HP with a 1-year warranty.