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Jetting for 03 Yz450F w/ FMF Ti-4

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I just ordered an FMF 14" Titanium 4 exhaust for my 03 YZ450F. I am keeping the original head pipe for now. Do I need to make any jetting adjustments to maximize the gains of the new pipe?

Also, did I read that there are gains by removing the metal screen on the air filter cage?

Thanks for your help.

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