I agree on changing out the panhard brace, but if you're not lowering your car, swapping out panhard bars won;t really do anything, but cost you $150.
The main reason we swap out to an adjustable panhard bar is due to lowering the car and the OEM non adjustable bar will push the rear end out the driver side if it's enough drop (generally more than 1") and/or you have wide tires wheels out back and you'll notice the tire to fender difference. The panhard bar attaches to the frame on the passenger side and to the axle housing on the driver side. When you lower the car (actually raising the suspension), it lessens the angle of the bar which pushes the axle housing towards the driver side. An adjustable panhard bar allows you to shorten the length and recenter the axle housing.