i just wanna know what the big difference is between a HB catback and a coupe/sedan catback. is it just that the coupe/sedan has one more piece? i was thinking about buying a HB catback for my coupe and wanted to know if there was any chance of being able to make it work out. I know this probably sounds like im an idiot, but can this work out and if so, u think its a good idea? my dad is a mechanic and one of the guys he works with does custom exhaust jobs but he will want an arm and a leg for it, so if i can do this then he shouldnt need much to make it work is what im thinking. thanks ahead