This will make YOUR exhaust sound AMAZING. Custom exhaust builders share fabrication secret! 

Order megaphones pre-built by yours truly here: fluidmotorunion.com/product/exhaust-megaphone/

Imagine buying a $120,000 v12 sport car and it sound like a Toyota Avalon.

Having made a few DIY exhausts on my driveway with the car on jackstands, I know how much work goes into it and how tricky it can be to get it all done perfectly. You guys are very inspirational

This is why a triumph motorcycle sounds so good it’s the cone exhaust that all the flat trackers run.

That exhaust sounds more like a Hellcat than an actual hellcat. What a demonic scream that things got. That exhaust fits that engine perfectly! Amazing work

"brands of oil to never use in your engine" 😂😂

Dude is BRILLIANT yet refreshing in a sense that those I’ve met who purport brilliance try and convince you they’re just that, seemingly always breaching that condescendence. O.J. obviously strives to teach and does so in a humbled manner. Cheers to O.J. and his FMU family-literally his family!

I haven't been to school in 20 years. Watching this video felt like the first day off school. I'll be watching this video 3xs a week . Great video

Wow. The education here is unmatched. Well done!🎉

This channel melds gearhead knowhow, with the intricate disciplines of raw science. Your oratory presentation was quite polished, & professionally articulated. Great video!

Anyone who understands anything about sound waves or even built a custom tuned subwoofer box should be able to understand what the diameter and the length of that vent can do to the sound.

_What a difference OJ, kind of like hitting the bricks in the gym. The more you structure your workouts(and yes to some, increasing the weight), the better the outcome(insert: OJ Lopez's physique). Hence, the more you fine-tune your 'custom' exhaust, the better your baby is going to sound(and yes increasing horsepower along the way). Side note: your delivery is getting more natural for the camera, damn good job all the way around._

Congrats on the big 30k subs! Here's to a million more!

Probably the best sounding Merc v12 Biturbo I’ve ever heard.

Expansion chambers are what we always called them. Been a thing on 2 strokes since the late 70s. You explain them quite well.

Amazing work OJ, usually these videos don't keep me engaged but your diction and knowledge are unparalleled. Keep doing what you're doing.

This was a really interesting discussion of the concepts behind exhaust systems.

Megaphones obviously made a difference. Early in the video "truck exhaust" was mentioned and I believe not positively. If I had to give a one word description of how this exhaust ended up sounding was like a truck, maybe the best sounding truck but still a truck. Like a big block with big cams not a Pagani exotic or exotic in general. Regardless of the result the information packed in this video is excellent and really appreciate the detailed breakdown.

Let’s goooooooo. Alex better have gotten his push ups in!!!

Factory exhaust is cheap ,is restricted and lacking a good sound. However the entire reasons for factory exhaust is to meet production cost , epa standards and federal dot safety standards. It’s not that they don’t care it’s that they have only so much room legally to get 600 horsepower on to the highway. Like a hand gun . Can’t buy it with the extended mag . That’s a customer option 😉

Thanks for the advice on my corvette! I appreciate the sheer amount of knowledge you have on fine tuning these exhaust systems and I especially appreciate you taking the time to share it with me.

Just a few notes... The results you got are great 👍. As a muscle car guy I was afraid of it sounding like an open wheel indy/f1 being that it would have even firing banks and so many cylinders. This is actually better than what I was expecting. But if you wanted an exotic f1 sound or to harmonic tune the engine it would be easy without megaphones which the math of those seems to be a guarded secret. On 2 strokes they are often regarded as sound wave reflectors but when glossed over in automotive exhaust literature they talk about sound wave timings extensively but then some may say megaphones don't follow the same mathematical model and require testing. Not sure why that would be but darin Morgan who designs intake systems that also use sound wave reflections talks about angles as part of the rpm range so perhaps the reflections aren't a function of the average length to the cone and just happen when acoustic impedance sufficiently changes so I don't have enough acoustic knowledge to speak on that. But I do know how you would typically tune collector extensions and primary header pipes when megaphones are not involved. Sometimes the path to the best x or H pipe placement is blocked but because it's harmonic there may be subsequent locations down stream. These down stream locations may be lower in pitch so if an f1 type sound is desired you may need to pinch a harmonic (ask a guitar player about string harmonics) to make it high in pitch if you so wanted to. To do this you could add a stepped pipe or an H or x at a half or third or quarter point in the path getting to the tuned point. A typical location for a x would be around 33" behind the end of the primary header pipes for a 6500 rpm engine, it depends a bit on gas speed (the back wave might be delayed in time more than the forward wave time is decreased by gas flow changing the exact length a bit from standard organ pipe math) and temperature. But if that's obstructed by the transmission or transfer case or cross member you could go around 67" with an H at 33" or 16.5." the x on many cars would actually be better placed near the rear universal than as soon as it fits by this math. Shorter for an 8000rpm engine and longer for a 5000 rpm engine like a stock cam or a long runner efi manifold like Ford and Chevy used in the 1980's on tpi and 5.0/5.8l engines. Those numbers are for 8 cylinder engines, the numbers for 12 cylinders may be shorter. The more pitch you want you would divide the distance to the x by larger whole numbers for additional reflection points. A guy who built a 5.0 Ford (yes classic 5.0 not Coyote) powered BMW for budget racing built a 180 degree header to get equal pulses and a super car sound. It worked but this type of build often forces you into primary pipes that are too long. It might work on a 5.0 because the intake is also very long. But it's not always best. So he then replaced the hand built headers with equal tuned length headers and used a triple x pipe to get the super car sound. So he had a pushrod V8 with odd firing banks not known for that high pitched howl and extracted that sound from it on a full length sedan simply by pinching harmonics using redundant x pipes ! Long pipes tend to mean lower pitched rumble but it can be manipulated easily by causing intentional reflections at equal interval lengths.

OJ i take back my mean and negative comment on the last aventador video... You did a great job bring out the sound on this one!

i love that you guys focus on tone and sound quality as much as you do performance/flow. i might have to take my Thunderbird SC with a custom single turbo setup to you guys to see what you can do with another infamously truck-ish sounding engine, the Ford 3.8/4.2 V6

Jaw dropped when you revealed the exhaust with megaphones. Amazing work!!

19:00 As soon as the no megaphone dyno pull was done I audibly said “holy fuck” LMFAO

It took me 13 minutes to realize this is mark rebillet’s older, smarter brother. In all seriousness, thanks for explaining things in the way you do 👍

Damn , that sounds really good, couldn't believe what a HUGE difference that made, and to be honest I wasn't expecting it. Great video, and thanks for the cheat sheet 😁

That original exhaust it came to you with is shocking for a car worth that much! Mild steel, crush bends and mig wire hanging out. I would be embarrassed giving that back to a customer. Fine on a 25+ old car but not on that

my goodness this blessed my monday morning ! sounds great !

That was very educational, feel like I should have took a test and got a cert at the end.. Thank you for taking the time to explain.

Thanks OJ !! Thats the real deal !!

Very comprehensive approach to performance and sound. Very well presented and to the point. Keep up the great work!

Amazing info as always. Thanks for sharing your knowledge, and displaying the talent level at your shop. Impressive!

Superior exhaust work guys!!! Love it!!!

This guy is an excellent host! Really knows his stuff, great video

Years ago I had a 5.0L V8 with a single 2½" pipe. It had an expansion chamber near the transmission (very similar to a Catalytic converter that had it's insides removed), then a straight through pipe through to a rear muffler. It sounded OK, but I started experimenting and hole sawed another hole next to the muffler tailpipe into the Helmhertz chamber at the back of the muffler. This hole lined up with the internal perforated pipe inside the muffler, and I inserted another short pipe into the hole and attached it to the existing tailpipe with hose clamps so that it could be adjusted to insert into the muffler chamber by different amounts. My mate and I took turns driving WOT and the other listening as we drove by. We adjusted the length of the new tailpipe until we got the best sound, then welded it in place. The results were amazing. Not super loud but more like a sub woofer effect, especially at idle. I guess it may be due to two out of phase sounds being produced? Strangely blocking either pipe had the same effect at making it quiet to about the same noise level. I had many people ask me who built the exhaust. So my question to @FluidMotorUnion is, have you tried placing the megaphones in each pipe at different locations to each other. ie, one close to the engine and one further to the rear. Or, placing them at close to the same length, but making a sliding connection on one so you can adjust it along the pipe by a few inches and move it slightly to experiment with different positions along the pipe while ethe other one remains in the same place. Please tag me if you try this, as I would be very interested... even though my revhead days are pretty much behind me.

That sound is awesome!!

Loving all the content and the detailed explanations:)

So much information in one video. Very clear and easy to understand

Dope, thank you sir. I will try this one day when I buy my first welder. You are awesome

Wow, that's an amazing tone\sound coming out of the back and you still hear enough of the turbo induction noise as well. Perfect balance of both. If there's no drone then that's actually the perfect exhaust!

GOOD JAWN!!! appreciate u sharing your knowledge and experience

Man what a difference that mega phone made. Sounds absolutely mint

If you think of the exhaust system as a wind instrument it gets significantly easier to understand, in fact there's a German channel that did an experiment with brass piping to further prove that point...And it WORKED...But it was a slight difference in sound albeit a pleasant one.

You guys did a great job, that thing sounds so mean now!

After watching one of OJs videos, I feel like I need to raise my hand to ask a question. Great job OJ !

Great information! Very interesting and looking forward to following the development of the system!

24v Vr6 vw is still one of my favorite sounding cars

Fantastic video! Ever since tuning 2 strokes with expansion chambers, i always wondered why there wasnt more exhaust tuning for 4 strokes... scavenging, pulses and waves have to account for something.

OK, I Was Very Skeptical. But That Sounded Good, I'm Impressed !!!

Just changing the outlet tip can make a difference. I have a 2000 silverado with flowmasters. It had dual 2.25 outlets. Changing them to an oval changed the tone. Megaphone of a sort.

Having witnessed the result of your efforts on Alex's LS swapped 911, I'm more than convinced of what you guys are capable of. That thing sounds absolutely venomous.

Excellent,sounds beautiful

Regardless of any subjective choices and fluid dynamics theory, it would appear that you do top-shelf exhaust system fabrication. Very, very clean and tidy, sirs. Well done!

Good rule of thumb! Thank you for sharing!

Sounds much better than my S65 did. Would like to see you guys test the Brilliant Exhaust merge pipe on these as well. Same style merge that Gintani made popular on Aventador.

Demonstrating this on a car that we can all relate to was a great idea!

First time I've heard one of these turbo v12s that don't sound mediocre, really cool video, the NA m120s that Mercedes and pagani used to use sounded divine

Two cycle dirt bikes have this, it's called an echo chamber. Clean work, man! Looks good! Sounds Great!

Great overview! And that S-Class sounds like a monster.

Dang I learned so much!!!

Interesting concept using the megaphones. I'd love to see this tried on an already great sounding NA engine, like a LS7. It would also be interesting to try using the megaphone and reducer going into and out of a high-flow cat system. That might flow better with a smoother transition into the inlet side/face of the cat, and the cat would tend to straighten the flow/soundwaves, before reducing back to a traditional pipe side. Only concern might be getting the cats close enough to the engine with the megaphone... But using the C6Z example I mentioned, I think one could place them in the early part of the tunnel with success. Could be interesting to experiment with!

Learned alot today. Wow, rethinking the build for my car now. Thanks

Sounds way better!!! And great work!!

Craziest Benz I’ve ever heard wow!

Wow. That sounds amazing.

Hell yeah I’ll be using this now

My Subaru has 2 mega phones on 1 pipe the expansion chamber for a 4 stroke or the power bomb in the fmf world but this is the key to tuning your exhaust tone

Totally awesome, now I'm not a big budget dude but I appreciate the sound and I'm looking at my Jaguar XFR for both power and noise upgrades in the exhaust, the builds that FMU does makes for great inspiration. Cheers team.

Great presentation. thanks 😊

Extremely intresting stuff. Greetings from Greece.

That thing sounds amazing nice.

Been seeing you on YT for awhile thanks for your knowledge bravo always

Watched whole video intrigued💯

Wow, it's the first time I saw your channel. My goodness, you're a very detailed person. Great explanations too.

Definitely subscription worthy ❤🔥💯

Top notch video, thanks!

I’ve had a Corvette C5 for 6 years. 180° headers 8 into one equal/unequal headers. all the major muffler companies. Doesn’t give me that exotic sound. I would love the car to have a hint more of. Definitely look into megaphones more might be what I’m looking for and keep me EPA compliant here in Cali :). thanks for the overview great video and insight

The structure and presentation on this video surpasses a lot of your others, bar none. While certainly educational as are the others, this one seems less rehearsed and is truly OJ pulling knowledge from his back pocket of expertise. Great video!

I’m going to try it 😊

Amazing speaker!! That looks like could be a US Navy Seal Masterchief!

Loving the knowledge OJ

That sounds awesome.

Fun fact a expansion in the exhaust like that creates a pressure wave that pushes backward creates back pressure thats why 2 stroke engines need that and thats why i know lol

The original "Ramchargers" drag racing group from back in the late 50s were a group of Chrysler engineers that were interested in drag racing. They had a very "sciencey" approach to modifying their "High and Mighty" 40s coupe. Those guys had a tuned megaphone hanging out of the bottom of the wheel opening on the front fenders for each cylinder of their Hemi engine. They also used long lengths of hose, similar to radiator hose, to run from each intake port out through a hole in the hood, and up to an intake plenum up on top of a "tower" on the hood. The carbs were WAY up there on top of the tower. The intake runners were very LONG. The intakes and megaphones were both tuned for 5000rpms, where the vehicle was shifted. The car looked strange for sure, but it worked well

Damn, that was fun... 😁 Enjoyed !!!

With the drawings on the dry amd erase board, it somehow reminds me of motorcycle exhaust system.

Nice work 👏

It sounds like a dragon now.

FMU: we’re telling you our secret because the only way you’re going to be successful with it is if you have all the equipment, resources and experience we have. The car sounds great by the way

i did a muffler/resonator delete on my lexus gs350, added vibrant bottle resonators and 3 inch tail pipes and it sounds really, really good for a V6 in my opinion. but i'm just curious, is there anything y'all would personally add/change to improve the sound of a V6?

Ooh it sounds so good

Why YES, Yes I will! I will utilize one on my 2JZ

Great video, would you recommend megaphone on a 4 cylinder na car? If so does it need to be far back or further forward to get a higher pitch?

Sounds pretty good

Beautiful explination and now it makes me want to try it. Obviously cylinder count has SOOOOO much effect on the sound and so does displacement But it would be awesome to figure out a formula that can closely give you an idea for how much length and size of the megafone for a specific sound range. Wonder how well itll do on a 3L twin turbo V6.

Good content! I actually designed my E39 M5s exhaust system after being inspired by FMU’s product for these cars. Now I want to add megaphones because I am looking for just a little more!

thank you for a great video and for sharing your hard earned secrets. the only video i've seen like it.

Love the video. Do you have a recommendation on 2019 F150 2.7 TT?