What needs to be cut or notched and how much?
Unfortunately there is no set guideline. You cut what needs to be out of the way! You will always need to make sure that the bag has PLENTY of room inflated & deflated. We cannot stress how important this is; a lack of room will result in rubbng the bag and ultimately cutting it up. You do NOT want your bag touching ANYTHING around it. How much you cut will depend on what brackets & what bags you use. Also you will want to notch the rear frame as much as needed for the drop you want. Other common notches are needed for tie rods, your inner wheel wells, and your driveshaft. But, again, it will basically come down to putting everything together and see what needs to be moved or cleared out.