I'm lookin at HMF, n Yoshi's, but wondering which way to go? And what other suggestions are there?

 

yoshi all the way but if you just want a slipon HMF

 

For slip on; HMF

 

i just got a hmf for my 01 400ex and am extremely satisfied with it, but it's all in how much $$ u wanna spend....if i had they $$ to blow i would of went full curtis sparks exhaust

 

i have a z 400 with pipe jetted and lid removed runs about 75 but gets thier quicker then before my brother has a stock 400ex untill this sat and he bought th eslip on hmf so we raced first i pulled throgh all gears quicker and faster we pipe and jet his and i still get a little mid range for some reason but the top spead is the same and the tkae off is the same but third gear i pulled ahead we did multipul runs and even swithced quads same result so bang for your buck it made a big differance on his and as for jet size we did not get one with the pipe like they said we would so we bought a few from the local shop and a 150 run the best the shop did not have a 152 or a 155 he did not notice much differance with lid on or off so he left it on if you plan on modifing your box i would say a 155 jet i live in iowa not sure of elevation but i think its about 600-800.

 

Ya i live in Nebraska so it'd be the same elevation, i'm thinkin that hmf is the best though for the slip on, i'll hafta look more into the jet but i think 155 sounds rite

 

the 155 is what we wanted that is were i would start if u are going to remove the air box lid