March 20, 201511 yr 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
March 20, 201511 yr 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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