The cat pipe on my plus 4 has often leaked and now it had a hole developing I have decide to replace it. Sometime ago I bought a S/S sports cat on E bay from a company called RIP who have developed a number of Morgan systems. Looking at the new cat pipe today it has fittings for two Lamda sensors, one pre the cat one after the cat. My original pipe has a third fixing with diagostic connector. The question is; should I just fit the new pipe, but if I do what problems may lie ahead without the diagnostic connector? Or should I find a firm who can adapt the pipe to accept the diagnostic connector. Any suggestions?