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Changing exhaust, need to change jetting?

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I am considering removing my Big Gun Racing Series exhaust from my bike (2002 DRZ 400S) and going back to stock in order to reduce the amount of noise I produce. I'm also trying not to spend another $60 every 40 hours to re-pack. It starts to add up and I have several bikes that I have to feed $ to.

I have Keihin FCR39 carb. What sort of tweaking will I need to do if I go back to the stock pipe and can?

If not the stock exhaust, what is a better option?

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