Dual exhaust

[One_Bad_400]

does any body make a dual exhaust for the 400ex ?

[sweet300ex]

if you count the DMC alien system with dual outlets they make them for your quad

[heavy_d]

no such thing as a true dual exhuast on a atv, only have one head pipe

[gojk]

Originally posted by heavy_d
no such thing as a true dual exhuast on a atv, only have one head pipe

Banshees have dual exhaust.

[cabex]

you could split the daul head pipes on the 400ex and attach two mufflers to it. I have always wanted to see someone does that!

Someone do it. It would be cool

[400MXer]

you could make a lot of things dual exhaust....like the 400 has two exhaust ports....and so does a few other quads.

[heavy_d]

never knew that

[mxdave28]

i only have one question.......WHY on earth would anyone want to do that???? personal opinion, that would be gay

[cabex]

just to be original :D

[300exazzkikr]

If you had dual exhuast on a 400ex where there was a header pipe for each uxhaust outlet then i don't think you would have the same power. I know you wouldn't..but it wouldn't be power for gain. You would lose power probably because you wouldn't have the same pressure goin out, and you would probably burn out the valves in the process.

[Juggalo]

300exazzkikr theres already 2 header pipes coming out of the 400. they just come together at the silencer. if you buy a DMC system it also comes with 2 seperate headers that never come together. it would be fairly easy to rig a dual exhaust system for the EX but so far nobody has done it.

[300exazzkikr]

yes but they come together at one point..thats how you get the pressure..Have you ever seen an X pipe where the headers cross on a V8...Same idea.

[Doibugu2]

300ex, go look at the pic of the DMC exhaust. It is a true dual header, they never come together. I don't know how it builds the pressure, but I know it doesn't come together.

I would like dual exhaust too, it would look to.

[99_400EX]

Originally posted by 300exazzkikr
yes but they come together at one point..thats how you get the pressure..Have you ever seen an X pipe where the headers cross on a V8...Same idea.

if my memory serves me right they do not go into one there is 2 seperate outlets in 1 housing if one were to cut into half they would have dual exhaust

[L.Vegas400]

i beg to differ,,,, not too long ago on ebay there was a 400ex with dual ehxaust. this was true duals, the pipes went down either side of the quad with dual mufflers. the set up was just like the banshee, one on one side, one on the other. it can and has been done.

here is the link,
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1871289757

[300exazzkikr]

alright you guys win..but it would be a waste of money for dual exhaust..it would look good but not worth it. You could get the same power out of another exhaust.

[L.Vegas400]

ive thought about building some and puting just chrome angle cut ehaust tips on them. this would be mainly just for pics, unless i can figure out how much back pressure the exhaust needs and how to measure it. would be loud as all he!!

[One_Bad_400]

300exazzkikr: you are completely wrong about this idea, let me see if I can explain it so that you can understand. A true dual exhaust system would help the 400ex, it would let more air flow, which in turn(just like every other performance exhaust) would create more power. it would get the backpressure from the muffler, that is what a muffler does, get one and cut it open there are a bunch of "chambers" to which the exhuast goes into but cannot escape, there for it goes back and has to find another way out. If somebody made a true exhuast system it would probably out perform many of the exhuasts on the market today, especially on an extremely modded engine. also, banshees have dual exhaust, look at a picture of one of them, it looks cool the way it has 2 exhausts coming out.

[300exazzkikr]

yes i know how an exhaust works. You are right. But the only way you'll get big power gains as you said is with a modded engine. I don't want to flame but i just see it as a waste of money thats all.

[BigThumper33]

The new kx700 has duals also. Anyway if the 400ex would gain I would be surpised to see anything larger than 1 hp more from it. There is no real point or reason for doing this except for orginality or looks. Put your time and money into other issues!

[300exazzkikr]

Thank you big thumper!

[One_Bad_400]

Originally posted by BigThumper33
The new kx700 has duals also. Anyway if the 400ex would gain I would be surpised to see anything larger than 1 hp more from it. There is no real point or reason for doing this except for orginality or looks. Put your time and money into other issues!


the new kfx does? are you sure?

[stupid driver]

id imagin that the kfx700 has duals. it is a v-twin, so im guessin each cylinder has a pipe. i cud be wrong though
:confused:

[DESDAK4]

D&D racing makes a true dual exhaust for the 400ex and the raptor but they both run down the same side. It is dual headers and silencers.

Jay
USAF

[Juggalo]

thats just like the DMC then

[AndrewRRR]

Two pipes for a single cylinder? Now I've heard eveything.
Banshees and the Kaw 700 have dual exhaust. They also have 2 cylinders.
I don't know what the loss of backpressure would do to your valves (yes, I know there would be a small amount, but with the greatly increased breathing, not to mention only half of each exhaust pulse going down each pipe it would be almost negligible), but I would wager you would be very dissapointed with the loss of bottom end power. And I dont' think a crossover pipe (X or H pipe) would help.

[Extremeracer167]

Originally posted by One_Bad_400
300exazzkikr: you are completely wrong about this idea, let me see if I can explain it so that you can understand. A true dual exhaust system would help the 400ex, it would let more air flow, which in turn(just like every other performance exhaust) would create more power. it would get the backpressure from the muffler, that is what a muffler does, get one and cut it open there are a bunch of "chambers" to which the exhuast goes into but cannot escape, there for it goes back and has to find another way out.

Ok one bad,
Snce u know so much about exhausts, explain to me how a TC exhaust works so great then. There are no "chambers" in a TC exhaust. Its a straight shot out the back. jsut curious how it works so great if there are no "chambers" to create back pressure???

[gojk]

I haven't noticed any chambers in any aftermarket exhaust for the 400. Matter of fact I haven't seen any glass pack type exhaust with chambers. The length of the pipe is what puts the backpressure as far as I know.

[AndrewRRR]

Most ATV exhausts use a perforated tube "packed" (wrapped) with fiberglass in an aluminum canister. Automotive type exhausts generally use chambers (except, of course for glasspack and similar mufflers).

[Extremeracer167]

FMFs have chambers, but most others dont. But he seems to think all mufflers do

[Juggalo]

Originally posted by AndrewRRR
Two pipes for a single cylinder? Now I've heard eveything.


for the last time- the 400EX has 2 exhaust valves and 2 exhaust ports, therefor it has 2 (read it TWO) head pipes stock anyways. they just go into one muffler. it would be no big thing if they just went into 2 different mufflers.

[AndrewRRR]

Originally posted by Juggalo


for the last time- the 400EX has 2 exhaust valves and 2 exhaust ports, therefor it has 2 (read it TWO) head pipes stock anyways. they just go into one muffler. it would be no big thing if they just went into 2 different mufflers.

I know that. It is still way overkill. Maybe I should put 4 pipes on my suzuki since it has 4 exhaust ports.

[Juggalo]

your talking about overkill and you have a crotch rocket in a quad frame..

[BigThumper33]

You have to have atleast 4 down pipes, or 4 tributaries up to the ports. Having 2 ports per cylinder is not overkill, I don't see why it would be considered that. The z400 has one large port so it has one LARGE headpipe, the 400ex has two SMALLER ports and 2 SMALLER head pipes. I don't know of any aftermarket exhuasts that are a TRUE straight shot back. They all have wrapping that I know of. The curve and length of the head pipe is a main contributor to the torque power of the motor.

[Extremeracer167]

when i said straight shot, i was reffering to TC silencer. There are no chambers at all.

[AndrewRRR]

Yes it has 2 ports with 2 small headpipes comming out. If you want to use your whole exhaust in that diamater i guess performance would be similar but I think it would look a little strange with 2 teeny pipes, most people want bigger exhaust. Bigger pipes would create much less backpressure. At least it's not a 2 stroke where the size and shape of the expansion chamber tune the power hit of the motor. I just think if dual pipes offered any performance gain, the hundreds of aftermarket companies would have figured such an obvious gain out.

I dont think my 600 is overkill. I'm looking into an ex pro-stock bike motor, 1000cc, 250hp. Too much power is barely adequate, especially when it comes to sand drags.

[Steve-o 400EX]

You would have zero back pressure. The pipes out there now are are very unrestrictive as is but on a one cylinder motor it would be too little pressure for the valves.

It would be kinda neat though:cool:

[DESDAK4]

They say the D&D pipe makes very good power but is really loud and it is not like the DMC in the fact that it does have 2 full head pipes going into there own silencer.

Jay
USAF

[stupid driver]

wut if you configured 2 300ex exhausts to the 400. they are configured for just one exhaust valve, so it wud make sense on the 400. it mite work

[400MXer]

The D&D pipe is also the ugliest exhaust on earth.

[Wheelie]

Stupid driver--

The 300ex has 4 valves, only one exhaust port.

Dual exhaust would look cool, but routing the left side would be a PITA. The only way I think it would be possibly is puchase/make an airbox that holds the battery, rectifier, solenoid etc.

[DESDAK4]

All he asked was if there was one made not how pretty it was. But on the other hand they are redesigning it as we speak and the silencers will now be billet with a billet end cap.

Jay
USAF

[timewass]

Have you ever seen an X pipe where the headers cross on a V8...Same idea.
Wrong. The X or more commonly called H-Pipe is to balance back preasuer between all cylinders. An EX may have two exhaust outlets, but it only has one cylinder. It may do some small balancing between ports, but not that much that you would notice any kind of difference.

[flyin#5]

this summer i had a crome old pipe sitting around so i took off the stock toolbox thing in the back and mounted it there. (this is with a 200sx but i know 400's have em too) i lined it up so it looked like it went into the regular pipe. just for looks thats all. mine fell off one day though when i flew into a ditch and a small tree go a hold of it.