Want more reliability, strength and clearance out of your X3, look no further. We wanted to create an arm that has the clearance for the rocks and mud but the strength to handle the desert and the dunes and we did exactly that. Our boxed a arms provide the most clearance on the market by a long shot. Our signature design utilizes a trough in the center of the a arm that allows the axle shaft to recess in to it for clearance and protection of the axle shaft. These arms weigh in at 18 pounds a piece, yes they are heavier than stock but all aftermarket a arms will be heavier but you'll never have to worry about these failing. As always our suspension parts have a no BS lifetime warranty.