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Should I core the exhaust before rejetting?

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One of my friends agreed to help me rejet my drz400s but he says that I should core the exhaust first because I'll have to readjust everything if I decide to core after. Is this true? And should I even bother coring the exhaust?

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no power gain, just better sound. Wont have to rejet after coring as the restriction is the small headpipe, not the baffling in the silencer. I dont know if I would want him/her rejetting my bike if (s)he didnt know that about drz's. For most bikes, jetting would be necessary but drz's have very specific jetting issues and (s)he/you should do some research (here on tt) before tackling it.

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