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I'm guessing the OP means exhaust but I know where you're coming from ;)

OH and to answer the question, I reckon the exhaust diameter will be different, the design could also be different. Some FR diesels came with a rear silencer only so the center section on those will just be a pipe.
 
the guy said it was 4 cm quite small i thought! Im doin a pipe turbo back so i got a back sectionn just need the pipe from the cat to back box then i need the down pipe and de cat