Has anyone installed the powerbomb header to their 400ex without any other mods at the same time so you can say what the difference is? I have a w/b e-series slip on. If you have the same combo with bomb head pipe please post a reply. I want to gain power for long steep sand hill climbs. Thanks.

 

Can you use the WB Silencer with the FMF Header?

 

Acording to W/B you can. I called them a few months ago and they said they don,t have their own head pipe but you can use the fmf head pipes.