Jetting change needed if just changing header?

I was talking to FMF and they are going to come out with a stainless megabomb.

I'm contemplating one for my 04 450 (got a ding in mine anyway). Would anyone expect a need to adjust jetting from going from the stock 04 header to a FMF megabomb?

On my 07 wr450 when I put the mega bomb header on.I went from a 175m jet to 180m that fixed it,but im at sea leval

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