HMF pipe

[Luke24]

Hi, I have a HMF full pipe system on my 05 400ex if I add a quiet core will I have to rejet it? Thanks

[JW450R1]

you may have to

[drag93ex]

it may be best to rejet it.

[stic]

i was told no from the mod at hmf forum.installed mine and it ran fine.no loss of performance just a hair quieter.dont like the sound...only run it if i absolutely have to.

[eliasxr400]

I put the quiet insert in and the jetting was fine. 170dj main and 42 pilot.

[Luke24]

Thanks for the info..

[stocktires]

So the quiet insert doesn't do too much?

[hornetgod13]

I do not rejet every time I install or remove the quiet core. Waste of time.