power from a hmf

[redexrider4290]

i am looking into geting a hmf exhaust for my 250ex i was wandering if anyone else has one and how much power did it give could you notice the power difference when riding

is it true you dont have to rejet for a hmf

[wheeltrax]

It gave me a noticeable difference on my 400, i dont know how much difference its going to do on your 250, it will make some no doubt. You would have to rejet to notice anything.

[redexrider4290]

i was looking at a site that sells hmf exhaust and it said for the hmf you dont need to rejet :confused:
y would you need to rejet to get any power

[watts16]

Originally posted by redexrider4290
i was looking at a site that sells hmf exhaust and it said for the hmf you dont need to rejet :confused:
y would you need to rejet to get any power



the pipe creates more air flow
more air and less fuel will make the engine to run lean

[redexrider4290]

but the site said that you dont need to rejet with it im not sure the name of the site but it apperd when i put hmf exhaust in google it was like the second site in the blue at the top :confused: