I've done a search and it looks like Peugeot clamps are the best ones to get for a standard Cat to a Magnex....

I always thought the bore would be different size but they fit.....it's blowing at the end of the join from the cat to middle box though as it's just got a load of paste and a factors D clamp.

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VW Golf GT TDI 115, 100k nooooooooooooooooooooo!