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If my memory serves me right. There is no rejetting needed if you use the Triumph off road pipes. Do you know there are 2 types of the shorty's.When they first came out in 2002 the tube inside was bigger less restricted. the ones now have a smaller Dia. pipe. Was told EPA made triumph make the change.I have ones with bigger pipe . Think it helps keeping Header pipe from Bluing.



The america and speedmaster both have double walled headers, so they shouldn't blue unless the bike is running ultra hot no matter what muffler you have.