sounds like you answered your own question on fitment. 
its not even close to a simple bolt on. you are looking at all new pipe, nothing on the mustang exhaust bends the way it would on an MN12. IHMO, there is nothing from a mustang exhaust system worth using on a tbird, cougar or MarkVIII
its not even close to a simple bolt on. you are looking at all new pipe, nothing on the mustang exhaust bends the way it would on an MN12. IHMO, there is nothing from a mustang exhaust system worth using on a tbird, cougar or MarkVIII