These bars can be used to move the rear wheel back 1" in the wheel well to help keep weight transfer to a minimum. Does require the lower inner fender well to be modified for correct fitment. No cutting required.Will not work with daily driver vehicle. These bars were made for drag racing in mind. Works with skinny tire setup in rear. May have rubbing issues with standard wheel and tire combo.*** Use anti seize on threads during installation to prevent the bars from seizing together!!!