Our upper a arms bring more to the table than what meets the eye. Our boxed design adds strength to the front of the machine and also more rigidity in design. The shock mounting tabs have been beefed up a tremendous amount over stock as well. What sets these apart from others is the geometry changes that we've made to the arm. Caster has changed and the high speed stability will greatly increase with the machine. No more fighting to keep the car straight or fight a wondering steering wheel in the choppy stuff. If you want more strength out of your machine, better handling and great styling then these are for you.