oh yeah and i almost forgot, if that is the case and you still would like to break 14's, im not sure if they make one for the mustang but Auto Power makes GREAT lookin functional roll cages that can be like a 4 pt cage. they are bolt in and take no more than an hour or 2 to install (in a vert, i helped put one in a hard top BMW what a pain in the ass lol) and people can still use what little back seat was there originally, it is pretty non intrusive and stiffens the car up immensely