Problem with cutting stock springs is as they get shorter, they get stiffer real quick. Aftermarket springs are made to be cut without increasing the spring rate or stiffness. If you are cutting stock springs, try to get new ones that haven't sagged. You really aren't saving money cutting stock coils, as the damage caused by the stiffer coils more than offsets the cost of lowering coils, not to mention losing any chance of a smooth ride.