Im not putting a cage in it till way down the road and boxing the frame seems extreme for a car that Im driving daily. Notching the back frame scares me too because im not a fan of taking my car and making it half as strong. I understand that people have done it and its worked out but with how much Im going to be driving it Im thinking more about if I get rearended and the frames notched thats a critical spot of resistance since it is already disadvantaged by being bent.