hmf

[z rider2]

hey, i have an hmf sport series slip on, but i'd like to put on an aftermarket head pipe, could i get an fmf powerbomb to fit? or do i have to buy the hmf header( its like 235$). also does a rev box make that much of a difference, the big gun says 2-3 horses, thanks for the help.

[LTZ400rider]

dont get the fmf header, get the hmf, fmf is junk and the hmf is designed to go with their muffler. and yes a rev box is worth it especially with the header. make sure u rejet

[firefighterjosh]

Get the HMF Header. You can never go wrong with HMF. Yes make sure you rejet. AS far as rev box. I have no clue.

[indyZrider]

if you put a rev box on then you should get the double rate valve springs to.