will i need to rejet????????????????

i just purchased a 04' yz450f, i am putting a fmf factory 4 full exhaust system on it and also a twin air air filter. just wondering if i will need to rejet to make everything work well together???????

I put my Akrapovic full system on and it runs awesome with stock jetting/stock air filter . I believe that FMF has jetting info on their website though .

thanks!!! ill check that out

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