ATV Riders Forum > Sport ATV Model Information > Honda TRX 400EX & 400X ATV Info > Stock Exhaust Modification:
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Hondamaster5505
05-13-2008, 02:57 PM
Ok.. This is for all of you who can't quite afford an aftermarket exhaust. You will see a gain, but not as big as an aftermarket would give you.
Silencer:
1) Remove tip from exhaust. cut off the s/a. is about 2in.
Hondamaster5505
05-13-2008, 02:58 PM
2) Drill two 2-in holes on the inside wall. right in the bottom right beneath the existing hole.
Hondamaster5505
05-13-2008, 03:00 PM
3) Reinstall 2-in tip. Your done! heres why this works:
red_rider38
05-13-2008, 08:58 PM
Did you rejet like you would with a slip-on? Was it louder, and if so how much? On my xr650r you remove the baffle for more power like the yfz450. I was wondered if I could do something similar in the 400ex.
AnDy7
05-13-2008, 10:18 PM
i did kinda the same thing except took the screen and out it on the back for a spark arrestor. yes it is louder, are some power gains, and i didn't rejet. If you don't want to have to do all that you could always just keep the tip off to, but don't get caught without a spark arrestor!!
red_rider_069
05-14-2008, 09:45 AM
Originally posted by AnDy7
i did kinda the same thing except took the screen and out it on the back for a spark arrestor. yes it is louder, are some power gains, and i didn't rejet. If you don't want to have to do all that you could always just keep the tip off to, but don't get caught without a spark arrestor!! i did the cut out that he showed in the pic above.. my dad was pissed but he did it for me.. then i cut the screen off the silencer and welded it back onto the tip.. so i had a screen spark arrestor.. and an end ti[ back on.
. i didnt like how it sounds though.. no rejet needed.. and i didnt drill any holes in the esxhaust .. but if you drill those 2 xtra holes it will be louder..;)
red_rider_069
05-14-2008, 09:47 AM
Originally posted by Hondamaster5505
2) Drill two 2-in holes on the inside wall. right in the bottom right beneath the existing hole. drill two 2" hoooles? isnt that too big?! lol i think more like 1 inch holes would be better? you might make a hole where u dont want to:ermm:
Hondamaster5505
05-14-2008, 01:30 PM
Originally posted by red_rider_069
drill two 2" hoooles? isnt that too big?! lol i think more like 1 inch holes would be better? you might make a hole where u dont want to:ermm:
Oops, sorry.
I meant 2 1in holes. Not a 2in hole.
So yeah, 2 1-in holes underneath the existing.
Hondamaster5505
05-14-2008, 01:31 PM
and btw, just cuttin the silencer out of the tip doesn't do anything.
You guys need to get that 400 on the dirt its a little too clean ;). I had a 400ex end cap and I did that and put it on my 250ex and its louder than stock and not loud enough to get the cops called every time I start it in my yard so I'm happy. There is no way my dad would let me drill holes in the muffler though.
lol, not to burst your bubble dude, but all that cap is doing is MAKING it louder. Not adding any power. Its the holes that do it, lol.
All i had was a stock cut tip (same exact thing as a power tip) and it added nothing. i welded the core back in.
mooseracerX
05-14-2008, 04:44 PM
Not to burst your bubble but really how much HP are you going to get out of a 250ex anyways? LOL
powermadd400ex
05-14-2008, 05:12 PM
i bought a billet exhaust tip and it made it much louder
not HMF loud but very nice. it has the tip and a little spark arrestor screen.
http://cgi.ebay.com/ebaymotors/2-Billet-Power-Tip-Honda-400EX-400-EX-ATV-Exhaust_W0QQitemZ180239822682QQcmdZViewItem?hash=i tem180239822682&
didnt gain to much top end but a lil bit on the bottom end
i didnt drill holes but i think i will after seein this thread
Hondamaster5505
05-14-2008, 05:16 PM
Originally posted by powermadd400ex
i bought a billet exhaust tip and it made it much louder
not HMF loud but very nice.
it has the tip and a little spark arrestor screen.
http://cgi.ebay.com/ebaymotors/2-Billet-Power-Tip-Honda-400EX-400-EX-ATV-Exhaust_W0QQitemZ180239822682QQcmdZViewItem?hash=i tem180239822682&
didnt gain to much top end but a lil bit on the bottom end
i didnt drill holes but i think i will after seein this thread
ah man. dude, they ripped you off. All it basically is is a stock tip with the baffle cut out and a fancy design... You couldv'e done the same to the stock with a saw for free..
And also, I think the extra low-end is in your head.. The tip alone does nothing on the 400ex. Drill the holes and the tip helps a lot then.
Hondamaster5505
05-14-2008, 05:17 PM
Originally posted by mooseracerX
Not to burst your bubble but really how much HP are you going to get out of a 250ex anyways? LOL
hmm.. 5hp? LOL
red_rider38
05-14-2008, 05:17 PM
What if I just drill the 2 1" holes and keep the tip the same.
Will that add power? My two friends that I ride with have 450's so I need all the little help I can get.
mooseracerX
05-14-2008, 05:20 PM
Originally posted by Hondamaster5505
hmm.. 5hp? LOL
Yeah no kidding probably around 15-20hp. Don't get me wrong its a fun quad but not a speedster or racer for sure.
powermadd400ex
05-14-2008, 05:22 PM
Originally posted by Hondamaster5505
ah man. dude, they ripped you off. All it basically is is a stock tip with the baffle cut out and a fancy design... You couldv'e done the same to the stock with a saw for free..
And also, I think the extra low-end is in your head.. The tip alone does nothing on the 400ex. Drill the holes and the tip helps a lot then.
but its SHINY! XD
Hondamaster5505
05-14-2008, 05:27 PM
Originally posted by red_rider38
What if I just drill the 2 1" holes and keep the tip the same.
Will that add power? My two friends that I ride with have 450's so I need all the little help I can get.
Sure you could do it, but i don't know if you'll see an increase. The stock tip is only 15/16 big.
Why not just cut the baffle out of it?
XXXRACER165
05-14-2008, 05:28 PM
Hey Honda Master. Should I try this on my 440? I like my WB E-series but the stock system is so much more durable.
Hondamaster5505
05-14-2008, 05:57 PM
Originally posted by XXXRACER165
Hey Honda Master. Should I try this on my 440? I like my WB E-series but the stock system is so much more durable.
ughh... I really don't know what to tell you..
Like stated in my previous post's, it WILL add power, but not as much as an actual aftermarket.
Now, if you have a stock exhaust lying around you don't mind tampering with, then I say sure, go for it and see what happens.
I would try it, and you might end up needing another 1/4in hole along with the two 1in holes, since you have a 440.
Worst case scenario, bolt the WB back on, no harm done.
400ex28
05-14-2008, 06:03 PM
ive seen a couple people here that cut their stockers into shorty's.
red_rider38
05-14-2008, 06:23 PM
Do you have pictures of the shorty? I'm going to go ahead and do this to my bike. It will still have Spark Arrestor, right? I read what they post but I don't understand. Maybe when I see it.
red_rider38
05-14-2008, 06:31 PM
I found this while searching the forums
This is cutaway of the stock exhaust (http://home.earthlink.net/~gellett/exhaust/index.htm)
Hondamaster5505
05-14-2008, 06:34 PM
The spark arrestor you have to make yourself. It's basically just a piece of metal mesh.
And thanks for finding that diagram. I was looking for it before but couldnt find it, so i had to make my own.
red_rider38
05-14-2008, 06:36 PM
The diagram looks like he split apart the exhaust so he could cut the internal pipe that comes from the header into the 2nd baffle.
I think I'll just go with the holes.
powermadd400ex
05-14-2008, 06:45 PM
this might be a stupid question but can you cut that whole wall? or is it not possible j/w
XXXRACER165
05-14-2008, 06:48 PM
If only I could make my WB header work with my stock muffler.
red_rider_069
05-14-2008, 10:28 PM
Originally posted by Hondamaster5505
and btw, just cuttin the silencer out of the tip doesn't do anything. The key to the extra power is the 2 holes. i did it for the noise haha not for perfomance.. for perfomance i got ma yoshi :D
05-15-2008, 07:49 AM
Originally posted by XXXRACER165
If only I could make my WB header work with my stock muffler.
please tell me your being sarcastic or joking?
Hondamaster5505
05-15-2008, 01:25 PM
Originally posted by powermadd400ex
this might be a stupid question but can you cut that whole wall? or is it not possible j/w
Yes, you can cut the whole wall, but that would be just plain stupid.
The exhaust would go right from the header to the back, like a straight pipe. With the 2 holes, it restricts it somewhat and still makes some of it go through the chambers, so it's not like running an open pipe
XXXRACER165
05-15-2008, 05:25 PM
Originally posted by FoxHondaRider
please tell me your being sarcastic or joking?
Actually I'm serious. The problem with a stock exhaust on a 440 is that it doesn't flow good enough. If I could use the large diameter head pipe for better flow (top-end power) and utilize the stock muffler. Make it flow better, it would be just as good as my White Bros E-series.
dariusld
05-15-2008, 05:49 PM
Originally posted by Hondamaster5505
but that would be just plain stupid.
:D :D :D :D :D :rolleyes:
05-15-2008, 06:46 PM
Originally posted by XXXRACER165
Actually I'm serious.
Well I doubt that, WB are crap IMO. Both sound just as horrible.:rolleyes: its obviously better than stock. but if you dont have money for a good aftermarket.. well i'd save up :D
mooseracerX
05-16-2008, 06:30 AM
Yeah very true although I would probably save up for something else. But to each their own.
drew3623
05-23-2008, 02:25 PM
I know this thread is a week old, but will this work on a 300ex too? I might do it to my 400EX but I would rather try it on my 300ex to hear how it sounds.
gel1197
06-06-2008, 10:37 AM
I bought a "second" end cap off eBay to try this on my 05' 400ex. I drilled the holes and cut the "second" end caps spark arrester and baffle off. ( I did weld a new SS screen on the modified end cap) My quad does breathe better now and it's sounds cool. All for about $20.00. My question is if I ever want to put the original end cap back on will the holes I drilled effect the "stock exhaust"? I have a K+N (w/outerwears), this exhaust modification and I changed the main to a 152.
I also put a 13 tooth front sprocket on and I am really happy with these mods. All for around $100.00 so I have more $$$$ for gas to ride!
Hondamaster5505
06-06-2008, 01:33 PM
Originally posted by gel1197
I bought a "second" end cap off eBay to try this on my 05' 400ex. I drilled the holes and cut the "second" end caps spark arrester and baffle off. ( I did weld a new SS screen on the modified end cap) My quad does breathe better now and it's sounds cool. All for about $20.00. My question is if I ever want to put the original end cap back on will the holes I drilled effect the "stock exhaust"? I have a K+N (w/outerwears), this exhaust modification and I changed the main to a 152. I also put a 13 tooth front sprocket on and I am really happy with these mods. All for around $100.00 so I have more $$$$ for gas to ride!
Glad to hear!
The stock tip will just quiet it down, no harm done.
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ATV Riders Forum > ATV Riders Mechanical Section > ATV Powertrain > drilling holes in muffler increasing power?
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View Full Version : drilling holes in muffler increasing power?
bansheemorphine
06-07-2005, 08:52 AM
I have heard of some people drilling holes in the air box lid to increase air flow thus increasing power, i was wondering if drilling holes in the very end of the muffler increasing exhaust flow would increase power?
jak1389
06-07-2005, 09:19 AM
i am going to say not the best idea. i guess try it if its the stockc muffler but i dont think it will work.
FoxMxRiders
06-07-2005, 10:01 AM
I think the same thing that jak1389
bwamos
06-07-2005, 12:53 PM
Depends on the ATV.
Most stock cans you can't really do anyting but replace.
Some you can use a holesaw to remove the baffle.
Some like the newer hondas you can get a different endcap to help a little.
Others the headpipe is the issue.
2-strokes... don't even think about it. Need a new system.
My reccomendation will always be a new slipon or full-pipe depending on the atv.
quading is fun
06-07-2005, 01:24 PM
my freind put a hole through his pipe...
it didnt work at all, i would suggest not putting a hole through it....
drifterx
06-07-2005, 01:44 PM
On a 400ex, there is suppose to be a mod where you take the muffler apart, and drill a hole in one of the walls somewhere. I've seen it somewhere, and i think it is suppose to help a little powerwise. If you put a hole in your muffler, i don't think performance would change, but it would make it louder. I did some stuff to my muffler on my 300, not for better performance, but to make it not sound like such a wuss.
It sounds deeper now, and i'm happy with the sound. I'm getting an exhaust this summer though, as soon as my next paycheck comes in.
bansheemorphine
06-07-2005, 03:22 PM
i did try it i put muliple smaller ones around the end and it made it louder which i kindof like and gave it a lil more power
omaits
06-07-2005, 07:20 PM
Why not just remove the entire muffler? I bet that would increase air flow. I bet you could also save about 7 lbs doing that. haha
red2004 TRX450R
06-08-2005, 08:49 AM
Originally posted by omaits
Why not just remove the entire muffler? I bet that would increase air flow. I bet you could also save about 7 lbs doing that. haha
I was just going to say that!
my firend did that on is DR250 or was it a 350??
any way it was the loudest thing i have ever heard!!!!
wilkin250r
06-08-2005, 10:52 AM
Y'all can bash and flame me for saying this, but I'm going to say it anyways.
I'm with him
quading is fun
06-08-2005, 01:48 PM
i hate when ppl mod their stock exhaust to sound cooler.... y not just get a new pipe with alot more power... they always sound better then a stock one with holes through it anyways, and its so much simpler...
greg_gorrell
06-08-2005, 02:45 PM
before he got his white brothers, my buddy drilled a bunch of small holes in the end of his scramblers pipe which gave a little bit more bottom end. i noticed it and it sounded a little bit better.
omaits
06-08-2005, 08:40 PM
In response to the removing the muffler comment... I was riding with my brother on his Craptor adn the exhaust completely fell off. It was the loudest thing I ever heard. It sounded somewhere between a lawnmower and WW2 airplane. Needless to say, he didnt notice much of a power increase.
hondarider2006
06-09-2005, 01:12 AM
Your not going to gain anything. Leave the stock exhaust alone.
...if anything remove your lid and re-jet until you can afford a good slip-on or complete exhaust.
quading is fun
06-09-2005, 09:48 AM
some guy rides by my house every single day about 100 times on a MOPED!!! the thing has no exhaust at all and u can hear it from 100000000000000 miles away!!! he must really be trying to get as much power out of that lil thing as he can... he goes flyin down my road goin like 60mph!!!
loc_mon
06-09-2005, 10:56 AM
After spending $7500+ on my quad, I could careless if people thought my quad was to loud. That's their opinion!
What about Harley Davidsons? they have the loudess exhaust on there on the open road.
FoxRacing81
06-09-2005, 11:09 AM
If they made a silent pipe that gave me as much performance as a loud pipe, id buy it. Example, the Sparks pipe is the best pipe everyone says, but it is also loud. The FMF Q is a very quiet pipe, but it gives you no where near the performance of a Sparks.
What I do is, for trails, I throw the stocker on...that way I can ride basicly where ever without getting *****ed at. Then for racing, I throw the R4 on. Simple! Plus...I like riding trails with quiet pipes....incase people are hunting or something...atleast it gives me less of a chance of being shot!
hondarider2006
06-09-2005, 04:33 PM
Originally posted by quading is fun
some guy rides by my house every single day about 100 times on a MOPED!!! the thing has no exhaust at all and u can hear it from 100000000000000 miles away!!! he must really be trying to get as much power out of that lil thing as he can... he goes flyin down my road goin like 60mph!!!
wow, and this has what to do with drilling holes in your exhaust:huh
quading is fun
06-10-2005, 10:15 AM
lol nothing really... its just loud and annoying
honda400ex2003
06-15-2005, 08:00 PM
It would also mess up the back pressure on the exhaust too and could make your valves wear out prematurly.
Couldn't it? Plus the only good thing about the stock exhaust is that it is quiet. And it has a good punch right when you hit the gas for the first 20' then it sucks. Just my two cents though. steve
2004exrider
06-15-2005, 08:30 PM
It would also mess up the back pressure on the exhaust too and could make your valves wear out prematurly
nope just a myth, back pressure is needed but just a little to have it run good, what will mess up your valves is if you run it with no header because it will get hot then cool down really fast then hot again which will cause them to warp. just as long as you have enough exhaust pipe to keep the heat in it will be perfectly fine. 2 stroke diff story on other hand
honda400ex2003
06-15-2005, 08:48 PM
Ok thanks for the info on that. Sorry for the wrong info on the back pressure and the valves. Steve
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The most popular type of tuning in the exhaust system of a car is to change the sound of the exhaust. The sound can be made not only louder, but also quieter than usual.
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