FTP Introduces the Wavetrac locking Rear Differential The Strongest 100% Locking Differential for your AMG. This Differential will single handedly eliminate your loose traction problems, and give you a more solid feel, and deliver power to both rear wheels equally at all times. You will notice a HUGE improvement on 1/4 ETs or just normal spirited driving. Once of the Best Modifications hands down you can do!