White bro's E, HMF, FMF...which one do you recommend

[RCWells]

This site actually has pretty good info on the HMF series pipes that are available. Not all these are available from HMF's site.

FMF makes a "Powerbomb" headpipe that is supposed to increase power, not sure if it's just a gimmick or not, but if anyone here can enlighten us as to it's potential, I'm open to info.

I personally will go with HMF can regardless and quite possibly full system from HMF. IF someone can convince me more power is made with the Powerbomb inline, then I'm certainly down for that.

???? Anyone????

[H400DAN2004]

im going to call HMF today and find out which one is geared toward all power.

i saw a curtis sparks system. but it does not seem they have a slip on.

anyone know who makes the most powerful head pipe? or should i stick with the stock one and grind the welds off

[Rootar]

the sparks x-6 full system is hands down the best exhaust anyone has ever made for a 400ex, you can grind you stock headpipes all day long and bolt on a sparks system finally and wonder why you didnt do it in the first place. (did this about 4 years back with my 400ex) the slip-on pipes arent worth messing with imo and ive had 4 different slipons and two x-6s there is a huge difference.

[RCWells]

So a little research shows the CS system is good. Perhaps that's the way to go then.

Do you have any links to information on the CS vs. others? I only found one shootout and it seemed to have been the best of the bunch, but would like to see other comparos if possible.

[honda400ex2003]

as far as i am concerned you should sit down and figure out where you ride the most. do you like top end, mid, low? this is the main factor in buying an exhaust. not just all out power. yeah great a Curtis is a great top end pipe. if you ride slow and like to wheelie and such favoring the low end power and torque a curtis is not the best choice. something with better back pressure would be better. as for head pipes this also changes your powerband and output, different bends different diameters, all make different adjustments to this. the stock pipe is a good pipe for low end since it is a bit smaller diameter mate this with a great low end pipe and you have a good combo for riding in the woods lets say. if you drag race alot, ride dunes stuff like that go with a curtis you will be happier with the top end power to keep you moving better in the sand or in the top of the rpms. each pipe is different so you have to look at the dyno runs to find out which suits you the best. for me the stock header and the t-4 made the best gains in the mid range and low end so i chose that since i ride alot of slow trails and occasionally open it up a bit. it is not overly loud at 95 dBs compared to something like a curtis sparks that is much much louder. this is also a consideration. so please do not make your purchase on all out power, do some reading and spend your money once and be happy you did instead of hating the exhaust for something it is not meant to do. Steve

[honda400ex2003]

heres an old shoot out from 2001 but it is a bit of a guideline and something to look at when choosing. look at the curves each one provides and where the power comes in and out. steve

http://www.ctracing.com/PD_ct%20phot...march_2001.htm

[H400DAN2004]

good point honda400ex2003. i am going to look into that. i mainly ride in the woods. some hard bumpy hilly terrain but then there is a few open spots i can really pin the throttle.

my guess is for me i would want a full system that gives me more low and mid rather then topend only. but for topend i would still like someone that gives me what i want down low and a little bit more uptop then the stock system. is that possible??

also them dyno charts. whats up with the big dips up top and then it picks back up again. ?

[honda400ex2003]

the setup you are looking for is a tough one, i ride about the same as you. i think you should stick with the stock header and get a slip on if you plan to leave the motor stock. if you plan to do a 440 or something a bit more extreme then def get the full. the stock header flows pretty good until you get up into more power. i am not really sure what the true term of the dip is but it is where the power starts to let off and even out i guess. i havent really thought about that. it is just how the 400 is i guess. most charts you see will do that on the 400 motors. they are just not huge top end machines unless they are built to be with an aggressive cam, full system, and higher compression. it sounds like you have some thinking to do and also dont forget to look into the lexx, motoworks, and some theres that are very nice exhausts for a bit less money and they are a bit quieter. Steve

[H400DAN2004]

Originally posted by honda400ex2003
the setup you are looking for is a tough one, i ride about the same as you. i think you should stick with the stock header and get a slip on if you plan to leave the motor stock. if you plan to do a 440 or something a bit more extreme then def get the full. the stock header flows pretty good until you get up into more power. i am not really sure what the true term of the dip is but it is where the power starts to let off and even out i guess. i havent really thought about that. it is just how the 400 is i guess. most charts you see will do that on the 400 motors. they are just not huge top end machines unless they are built to be with an aggressive cam, full system, and higher compression. it sounds like you have some thinking to do and also dont forget to look into the lexx, motoworks, and some theres that are very nice exhausts for a bit less money and they are a bit quieter. Steve

thanks steve. yea i am going to open my options a bit on more exhausts. this is almost as frustrating and modding a car. lol

[honda400ex2003]

yup welcome to the madness. there is a ton of stuff to getting your machine to perform the way you want it to, not just buying this cause it is the highest this or the best that. it has to flow together and become one not a bunch of different stuff working against each other. i have a machine that i would say is pretty nice, it keeps up with alot of machines and has beat plenty also. it is reliable and was not real expensive to build up. it isnt the fastest but it performs what i want it to do. that is all that matters. steve