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2015 Repsol Header Pipe Size Recommendations?

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Looking at putting a Mitani Ti header pipe on my 2015 4RT.

Any suggestions on what diameter to get? There seems to be a few to choose from. Not looking to modify the muffler entrance so any input appreciated.

Mark G

With the standard 25mm you won't have any fitment issues, otherwise you may have to fabricate some sort of seal.

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