That much power by only a diff exhaust??? CHEESE AND RICE!!! I very much appreciate what you do for the power saw community brother!! PLEASE test a stock can with dual port AND stock can with enlarged factory outlet 🙏🏼🙏🏼🙏🏼

Too many guys are obssessed with tuning engines & not chains these days. The biggest performance gain that can be had with bigger saws is how well the chain cuts. And trust me, it takes a lot of messing around & searching to start making magic. But when you do discover that ideal grind for whatever wood you're in, you'll know it. I was lucky to be able to study several old timers who had mastered the square ground chisel bit.

My neighbor used to complain about noise, I should put that trumpet muffler on, that’ll show him :-))

Them ironhorse style seem to work really well

i did a copy of iron horses pipe, the 90 degree style and it definitely pulled better and longer but the noise was a bit much after awhile, however with a good set of muffs (supposed to wear em anyway) it was worth it to me because the single biggest advantage was a good one, it got lots of heat out and ran cleaner. The saw now doesn't get anywhere near as hot under load as it did with the stock muffler and that has to be a good thing for longevity. There was less carbon build up as well.

I’m so appreciative of you doing these I have tried so many different pipes

Try putting two of the megaphone style you made together with the big ends,in theory one would think it would work like the expansion chamber... like to see the results

Man!!! I really appreciate you doing these, kinda wanted to ask but I knew how much work it would take. Thanks for removing the subjective. Best damn video out there on pipes.

Read my mind lol was making myself a pipe for my 372 today and look what the topic was today! Great videos! Keep them coming!

thanks for all you do Joe.

thank you for making these video's. every video is an education! i am sure you already have viewers who are building faster saws because of the knowledge you have shared.

Another great video Joe!

Very interesting Joe! Thanks for the comparison!😁

Awesome, well done sir. Thank you. Looking forward to your next video.

Acàully with a two stroke or deisel. It's not eliminating the muffler that makes the difference. If you ad a expansion chamber like a dirtbikemakes a huge difference. The expansion chamber pulls more air into the cylinder just through natural convection try doing a tuned type pipe and watch the dyno difference u could likely come up with something that people would buy. Just a thought

Awesome! Good interpretation of the data👌

Enjoyed it. Keep'em coming. 👍

man you must really love your job! it must be nice to do something you really, really enjoy doing everyday

That's a crazy hp increase. Nice work!!

That puts that debate to bed then 👍🏻 Great content man.

Thanks for the great content very educational

Great stuff there really shows what goes on on different types of header pipes clears up a lot of mystery that's floating around on the tube keep up the work you're doing an awesome job and I'm hoping you ignore all the haters they just don't got the the skill and talent that you have!!!!!

it would be interesting to see just a straight pipe in different lengths. Love the dyno videos . Victor from Sweden

You are the veritable and venerable Saw Doc.

Love your content!

I like your unbiased evaluation of the mufflers. Not hating on one particular brand, and let's face it we all have our favorite and I'm sure you do to but your not trying to rm it down people's throat. A true benefit to you tube.

great idea for this video.....keep them coming

Awesome video.

Great comparison video. I wish you tested a Rippa dual port muffler. I put one on my saw and it was amazing.

Great comparison thank u

Love this one. Very interesting. 👌

Id like to see a dyno video comparing the typical muffler cover options like the barkbox, striaght shot type but with the factory outlet on the main muffler housing plugged using thin metal in place of the spark screen. Then reinstall the screen and run the dyno again and see what this does to the low end of the saw.

Neat to see. I've mostly used opened up stock mufflers but might have to try a straight curved pipe, seems like small difference in length makes big change were the saw could make power

Thank you DJ.

Great video

Another very interesting video! Great work! 🤝🤝🤝

Another great video!!!!

You are the man!

New sub, enjoying your content! Looking forward to the stock muffler mod tests! 👍👍👍👍🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🙏🙏🙏🙏

I like the Ironhorse pipe. Cheers

Muffler mods are so effective and easy. Interesting to see what the differences are.

nice well done

Nice work

Great work! Looking forward to a dyno review of standard mufflers with various mods.

Stock style mufflers!!! I’ll be looking forward to that episode.... always great content always thumbs up

Very nice, great collection of data

Great vid, Joe. Very interesting. Can't wait for stock can test, I reckon a stock can with pipe/s will make the most power is my thinking. Large volume to small🤷‍♂️. 👌

Holy shit pipe 1 woke that thing up quick

I gotta get me one of them megaphones, the neighbors will love me😎

Nice I never would have thought an open pipe would have made more tq I tend to under muffler alot of saws

Subscribed&Liked, I'm OCD Re mufflers-in-2strokes and 660's are my platform (am "a Tree Co" and use my 2511 like 95% of the time on-job, lol, but only experiment w/ my 660's), I'm like a kid on xmas not only getting this video but also that you say you *did* go and do a 'box type comparison' because that was one-of my biggest thoughts the whole video, "Where is the 'usual muff-modded box-type'?", felt odd not having it there so we could see not only that the pipes are better than an EPA-compliant OEM, but seeing a non-EPA-compliant OEM-muff-box would've been cool (though obviously it introduces the Q of "what, specifically, is a 'usual muff mod'?", but I'd say it's fair to simply enlarge that main OEM outlet on clutch-side rear upper of muffler and leave it like 50-75% larger hole than stock-spec, should negate "EPA&noise concerns" because the OEM exit-portage totals well-under 70% of the exhaust-flanging which is the upper limit for muffler-exit so far as I understand it) So eager to see the box-type comparisons, not only to compare to my own but because I just got a new one yesterday that I need to build for my just-finished "felling saw" build (99/81/125 squishing 24.25thou big bore 56mm with no freeport about 1.25mm from-freeport, ported piston / gearing/ignition advancement/etc) and I need something else it is too much pressure in that box/muffler with this build & my current exit ports, I am honestly thinking the best is going to actually be a combination IE a muffler like the 660s where it allows the charge/pulse to "bloom" beautifully and 'cyclone/swirl' back at the flange area, exiting via a port whose location *forces* the exit stream to "pass" the flange, this keeps a "cyclone effect" which is basically all/the best we can hope for with our lil mufflers, I'm betting that if you took the 660 can, seal-up all the outlets on it excepting the 1 largest OEM one, and have a pipe that originates there, instead of bolting to the flange, *that* would be the best because the can effectively becomes the 'expansion chamber' with the attached exit-piping being its "baffle cone/convergence cone and bleeder tube/exit" (ideally it'd be a tube that was like 0.75"sq surface at its entrance from muff and at its exit to atmosphere, but had a bulge in-between, like if the tube were 3" long the first & third inches could be 0.75" tubing and the central would be 1" tubing...obviously it needs to bend, am guessing it's obvious I don't personally weld :P ) So with the greatest respect for this video, I'm curious: - do you think the results would've changed, radically, if you (or any of the pipe builders) had done all 3 builds? I ask because the comparison compares 3 forms of pipe-muffler but, to be a good comparison, each type should be "a good representation" of its style...I think pipe #3 has the best "logic" behind it, yet it didn't win, and my immediate thought is "Of course #2/the longest/largest-bodied pipe wins, it's closer to real-piping and our mufflers' weakness is how far from 'real piping' our exhaust systems are! - Do you think your megaphone was a bit too large? Perhaps even too quickly-expanding (ie having smaller, more frequent increases in angle to really coax a "smoothly enlarging exhaust-pulse-front") Thanks so much for making such awesome content, eager to go check what else you've got posted, will say that I am a bit confused that you seem to say "straight-dump muffs like Egan/Bark Box already have #'s that speak for htemselves", I mean honestly you can game numbers all day and there's simply no logic behind say the Egan plate where it's quite literally creating a >1" exit portal dead center with the exhaust pulse, that is as-if the reality were "no muffler is ideal" but that is not the case, and so many do sadly fall prey to that thinking because un-choking OEM, EPA-influenced mufflers does work so frequently (although so often it DOESN'T work and people falsely believe it does, as I am sure you know there is power to be gained by opening-up a restrictive exit towards "its optimum" but, if you surpass that optimum, performance nose-dives quickly, being 5% past optimum is far worse than being 10%+ below it!

Amazing findings! I'm eager to see what an opened up stock can will do, as they're obviously much more practical. The noise, your poor ears! 🤯

I did an expansion chamber and hid it in a regular muffler with enlarged vent on the muffler body.

I like the iron horse style because it adds power and blows the chips away from my face

Very interesting

Add a whistle intake into the muffler close to the cylinder. It evens out the gas pulsations in the muffler.

VERY nice thanks Joe. It's nice to see that some of the very simple exhausts actually do make some good power gains. What was your thoughts on the noise levels. They all seemed relatively uniform except for the megaphone but it's impossible to tell on a video.

I would like to see some DIY pipes for A vintage HomeLite xl 12 series saws being a collect done on bone stock saw for the power and torque gains if possible

Awesome content Joe. The 90deg is already better than stock across the board and looks like it could be great for milling. Could you re-run that one with a few different outlet sizes to see what adjusting back pressure does to the hp torque?

I am interested in the expansion chamber type those always give u the biggest widest gains. Another alternative is to turbo charge it not hard to produce a tiny turbo to go on these would really power torque these little motors up. I'd love to help design something be fun to have a little saw putting out 100 horse power Wich these are capable of look at the junior drag cars check the dyno numbers

Very good comparison. I wish you would included a stock pipe that's been drilled out. Thanks

Iv wondered about a gutted stock pipe ( baffles removed) but nice work mate cheers

Should try the bark box out on the 660 vs stock as well. Seems like that and a simple nipple pipe on the stock cover is the only ones that were missing

Nice comparison between the different style pipes. Just a thought I wonder if the black 90 degree muffler could be tuned. Longer or shorter on the big pipe after the intersection with the smaller one? Just a thought

GB DD ftw!

Can I make a muffler for you to send in? If your going to use that 660 I can make any style you need. I love this stuff. Great video as usual Joe!

The color codes help a little. But it would be so much more clear - if he always kept the "most powerful" displayed beside it's #s as a thumbnail/picture of each pipe ("or saw": when it's a saw comparison video) to make it constantly clear showing which one produced each different colored line always showing the image of what is being tested - in line with the end of it's corresponding lines. & also after each its own little list of achieved #s. Displayed on every chart or graph he ever displays. That way it would always be "instantly clear" which one he's speaking of / pointing to / or highlighting.

the difference in decibels would be good to see.

Really would have liked to see Samish Saw Works (Benwa on ope) sq tube twin horn style. He has a vid of it making good power on a stock 50 IIRC.

Awesome what about the back pressure panic 👍

This is an impressive test. 😉👍🏻 I would want a setup that makes the most decent power increase but keeping the noise down close to stock if possible. Likely the tuned expansion pipe is quieter if I remember right while making the best power.

Because this is a two stroke and not a four stroke, a straight pipe will only make more noise. For it to be of any benefit, it would have to be an expansion chambered exhaust, the same as hot saws and two stroke dirt bikes

Does the Singapore mufflers that you're using their work better or is a dual Port like the iron horse with the Rams Horn or the ticket to the bush work the key to the bush work better than them give me the best report

wish you had tested the stock muffler with a 2nd port added.

You should do a comparison of the west coast bark box and the egan straight shot on the 362,661,462,500i,and 400 just to see what preforms best

Ive got this jonsered cs 2152 but havent seen anything for them, do you make anything for this saw thats would make a deference in power? Or know of one that offers them? Its completely stock Thanks 👊

Have you ever seen the fan showdown by major hardware on KZfaq. I think you should do something like that with chainsaw exhausts. Have people send you in exhausts for a 660 or a 372, something popular, name the pipes and rank them on a chart. Think this would encourage alot of interesting designs, we would learn alot and it would make some good content.

I know nothing but have a Stihl 032 that is my "toy" saw. Looking at a bunch of these interesting pipes, looking at expansion chambers, and looking at my stock muffler, I wonder. OK, stock muffler innards, a length of smallish pipe into a big box, out a small outlet. Expansion chamber, length of pipe into a big chamber and out a small outlet. Could it be that my dead stock muffler is as good as it gets?

@dynojoemods2764 , you are mentioning testing the "stock" mufflers. can you please also try to play with the volume of the stock ones and run one with a spacer between the housing and the cover? Weld a spacer in there of 1/4" then anther one of 1/4 (=1/2) after the first run and see how they produce ...?

Kinda sounded like the 3rd pipe was 4 stroking a little longer than the other pipes. I’d be curious to know if a carb tune would change the numbers

My homelite 925 has a rotten muffler and it exits straight down and the smoke boils back up in your face I built one out of 1,1/2 to 2 ,1/4 with forward exit but it was to heavy so I am going to go 1,1/2 to a tomato sauce can then forward exit 1,1/2 I think I will tig it with silicone bronze if I can weld it it should be light weight I guess I'll see if it can be done by the way that comparison was super cool thanks Joe .

The farmertec 372xp comes with a hollow muffler. Probly all the farmertecs are hollow. Be nice to know what the performance and sound(metered) difference is.

Is there anything inside the long tube pipe? Looks like its been split and welded back together.

I’m not gonna begin to pretend I understand this. Good video!

Nifty to see!

Wish you had a stock muffler modeed added into this test

Using better for power or is it a du al ported pipe that works better like the key to the bush or the Rams Horn from iron horse better or not or do the ones that you're using better give me the difference in the answers of most on the differences

👍🏻

Pipes 2 & 3 sounded to be tuned considerably richer than the others. The stock muffler and megaphone were considerably leaner. I would love to see tests showing how much difference the tune makes.

I was told the cs590 stock muffs are difficult to hog out but are basicly a straight shot if you do??? Im sure the 620s are the same muffler

👍

Finally

Any plans to repeat this test but add a bark box or a straight shot muffler cover? I see a lot of people using these on their saw and they are obnoxiously loud and makes me wonder if they are better than the stub pipe you tested.

Could you try a very small diameter pipe? Like a 1/2"?

I just made pipe 3 for my 395

I'm running a Husqvarna k650 50mm on a motorized bike, do you have a suggestion on w 😚hat would work best? Expansion chamber?

Did you adjust the carb before each pull on the dyno?

I will be the first to admit that Im completely surprised that any of those made more power. Still for the small gain in power its not worth the noise or lack of spark arrestor

Hey I have a question, is it a good idea to pipe a 455 Rancher with a pipe like the iron horse? Or is it better to just modify the OEM muffler? I have a 455 xtorq that I’d like to put and iron horse pipe on but hadn’t seen anyone do that on the web. Thanks for any info

That was a good one.its looks like were looking at cam dyno sheets.I guess the pipe act's like the cam in two strokes.I like the long pipe 2.I have a sthil ms 261 I wonder if there's any power to be made if I made one?