Which header?

Which header do you reccomend? I have a bored out wr400, so a header for a WR426 might work better for my bike. Is the FMF Powerbomb the best?

I have one on my 03 450, it may give you a little more bottom end but it is definetly quieter. :)

I went from stock to a Powerbomb SX. More bottom end, but I am not sure it was any quieter.

I think i'll get the powerbomb MX, and put my cam timing back to YZF specifications. thanks for the responses.

I am happy with the Powerbomb SX :)

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