Alright, I got my 400 a couple weeks ago and I am already gonna start putting money into it. I eard most pipes only add 2-3 horsepower, so I ordered a White bros E series silencer. Do I need to rejet? And I have been hearing about this header mod, can anyone explain to me how to do this, and will i need to rejet after that?!! Thanks alot to anyone that helps. Sorry for the long post.
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