David Vizard's PowerTec 10 EP 27 Zero loss sound legal muffler systems

In this , episode 27, DV shows how to build a zero power loss exhaust system that has street legal sound levels. That is good news in itself but the best news is that the procedure for this muffler system build is not that complicated.

If you purchase the 90 day trial versions for $10.00 The same as above applies after purchase of full versions plus the $10.00 trial purchase price for a total of $35.00 refund.

[marvingvx]

TO ALL THOSE WHO HAVE MADE COMMENTS. i AM OVERWHELMED BY THE NUMBER AND THA GENERAL THOUFGHTFULLNESS OF THE CONTGENT OF THE COMMENTS IN GENERAL. THERE IS NO WAY I CAN GO THROUGH AND TYPE OUT RESPONSES. BECAUSE OF THAT I PLAN TO DO A SPECIAL VIDEO FOR YOU GUYS WHERE I PICK OUT THE BEST COMMENTS AND REPLY TO THEM. WILL LET YOPU GUYS KNOW WHEN I BGET TO THAT!!!!
THANKS ALL!
DV

[jorgegomez]

I remember the sonic turbo muffler
In that article they did beat all the others
As usual not surprised that David had
A hand in it.

[GlenJS]

Dale here. I am glad that you have mentioned that the engine does not need back pressure. I have talked with many people about this, and they always say that there needs to be some type of back pressure. As I mentioned in another video that you did "Grumpy Jenkins" once made a comment about using slightly larger exhaust manifolds (in this case headers) so he could block backpressure and therefore gain a few more horsepower and a slightly quicker time on the track.
With what you are talking about here validates his comments and makes me want to agree with you about the person who demands that the engine needs that backpressure is either ignorant or parroting words that someone told them were gospel. Thank you for the information that shows the fallacy of that view.

[johnw]

Only comments I have are, "Thank you" - "Please, don't let reading comments get in the way of making really great, informational content" - I am sorry to hear of the recent loss of someone else who has journeyed many a year and many a mile by your side. Grief is not something we endure alone, however, because every one of us knows the feelings that surround it themselves, too.
You do your family AND your closest friends proud here, sir. What a journey you share with us! Tha k you for bringing us, "the pubilc at large, " into your life.

[alanhardman]

ALWAYS a good listen for anyone who wants to learn. David is one of the world's best teachers, easily! Thanks, David, and please keep up the great work!

[martinharris]

Sonic Turbo mufflers, boy, that brings on some nostalgia. They were all the rage back when i was messing with A series engines! REALLY interesting about SuperTrapps. I nearly bought one of those things. Flowmaster? WOW indeed! Everyone raves about the laminar flow theory. I trust the Vizard oracle, however.

[mikedeal]

Thanks David. More good stuff. I have read some of this in your books but having you explain it makes it much more clear. I appreciate the time it takes to do these videos, and enjoy the storytelling that goes along with the technical stuff.

[davidparker]

I am not a V8 guy, I love this type of universally beneficial information.
I truly appreciate the time, effort and knowledge that David Vizard and his staff have given us with this series.
Keep the excellent videos coming and I will watch & like them (I'm already subscribed)

[benhowe]

Best muffler explanation I have ever heard. I have suspected that this design of open chamber at the end of the collector would work and built a system using a large bore Magniflow at the end of the collector with a tapered outlet. Did not realize the need to have an eight to one ratio. Thank you. Also the 2.3 cfm per hp is extremely helpful. Back to the welding bench.

[jamesmumford]

I still have a set of 2.5” Sonic Turbo mufflers on my 57 Chevy 150 series 2 door post. I have had them since 1986! I added a balance pipe to make them even quieter. These have always been outstanding mufflers, great performance and sound without all the unnecessary decibels. So glad I finally got the chance to say:” Thank you David, for designing such an excellent muffler!”

[GB-ziqr]

Just about 20 years ago, after reading David's exhaust tuning book, I designed a custom exhaust for a 1979 truck I had. My best friend at the time couldn't believe how well that truck ran and it had a stock 350 with just a Edlebrock Performer RPM intake and a 550 cfm Edlebrock performer carb. No, the truck wasn't truly fast but it did surprise a great many people. The absolute best part...All the "Noise" the truck made was induction growl. Many folks just couldn't figure out how that truck made "That Sound" when "getting on it" and have no noise otherwise.
I'm working on a 302 based '67 Merc. Cougar now, can't wait to apply the same principals.

Thanks David!!!

P.S. Yes, I've read your cylinder head porting book. I already have a set for the 302, just have to get the car safe and legal to drive.

[Foxtrot]

Thanks David. Those mufflers went in many of my hot rods growing up and brought many fun times. You are a true LEGEND!

[StephenGiovi]

David: first of all, I would like to send my condolences for your loss with a family member. Second, thanks for your presentation on sound and performance using mufflers. I have been dabbling in sound quality and horsepower gains myself on a very "backyard mechanic level" to discover some of the same flow bench testing you have presented. Motorcycle two stroke engines have the same design characteristics by using an expansion chamber before the resonator/baffle section on the system. Cud-dos to you for explaining this insightful information to your viewers. Furthermore, I will get busy with my own build, and try to report my experience in timely manor with track times as a guide....see ya later, and thank you!

[josephschaefer]

Exhaust pipe thickness is worth mentioning. Quality thick exhaust pipe makes a very big difference in noise level

[b.knutts]

That is the best video I've watched in a long time! It makes me want to cut my flowmasters off amd start bending some pipes. Thanks for the knowledge!!!

[ronnieb]

The supertrapp guy at PRI reminds me of when somebody tried to tell Smokey Yunick about engines and racing .... his response was " Its not often I get to hear a genius Very humbling knowing how many patents and advancements in engine technology that he had his expertise in. You Mr Vizard are as much a genius as Smokey was. The only way to learn things is testing on the dyno and flow benches to know for sure.

[flathead]

This man would make an army of friends in the motorcycle world. Harley Davidson riders would love a quiet bike and all the torque and horsepower

[EricErnst]

I've been quoting your articles on exhaust flow for years. You're brilliant.

[am]

I’ve been an exhaust system geek for over 30 years and the high science behind this vid is much appreciated. I watched it twice😂

[ChurchAutoTest]

Wow, I remember reading Mr. Vizard's work many decades ago, including the original piece on zero loss muffling. Great to see him still putting out content. Way back when I couldn't figure out how to effectively put a termination box on my 4 cyl race car with my limited fabrication skills, but we found that using a factory catalytic converter body (with the catalyst block removed) as a poor man's attempt at a termination worked pretty well. It was about twice the diameter of the header collector, smooth inlet and outlet, but only 4-5x the volume of one cylinder. Along with a large Dynomax Super Turbo suitcase silencer at the back, it made the sound levels quite tolerable and we never had an issue with getting flagged for noise - from the exhaust at least. Now that open element intake was a different story - had to build a box for that