400ex exhaust!

[Quad Freak #1]

i have a hmf slip on. and i have been told that a fmf header will work with the hmf slip on? anyone know anything about this? and if so does it helf out at all?

[honda400ex2003]

i believe you are right, the fmf power bomb does i think. i am sure it helps to have it but how much i dont know it all depends on what you have done and where you want the power to be. steve