Mate had a pegaso and im pretty sure the header pipes from the XT where larger than the pegaso. That and you would probably end up having to get a one off link pipe/s made for the cans as the frames are different so the routing would not work with just off the shelf cans.

But at that stage why not buy a 2into1 header and a pipe, then get someone to make a link pipe between, should be cheaper and then you can get what you really want.

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Plough on