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stock exhaust going, going, gone!

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I have a 07 KX450F With stock exhaust system! I have purchased a Jardine RT-5 slip on spark arrestor. I pretty sure I will need to rejet the carb? If so what is a good combo to bump the main and pilot up to( example; up 2 sizes on main and up 1 on the pilot). thank you in advance!:thumbsup:

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didnt need to rejet my for the rt-5. It absolutely ripped off the low end, top end was the same and cleaned up the bog i had with stock exhaust

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