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Suggestions For Muffler Trial

ProModMike

By ProModMike
in Engines & Drivetrain

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ProModMike Enthusiast

ProModMike

Posted
  • Author
Posted

 

Ok... one last question for now.

 

So the 12229 is a 3" muffler... do they have 3.5" version of this? Doesnt the 6.2L have 3.5" piping, so a 3" would work but 3.5" would be best?

They do have a 3.5" version. The pipe on our 6.2 is 3". The mufflers don't appear to be internally different from a 2.5 to a 3", so I would have to assume there isn't any difference internally between a 3" and a 3.5". I haven't mic'd the inside or anything and I'm just eyeballing, but I would think that small amount of flow volume increase would do NOTHING beneficial. Nothing detrimental either though. Buyer's choice really. Our goal was again to replicate the desired effects gained from the GM Borla system and in order to do so, we mimicked it's dimensions and configuration.

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6D9 Matt Enthusiast

6D9 Matt

Posted
Posted

Ahhh... ok good. I would want to stick with the 3" version then. Thanks!

jrob56 Enthusiast

jrob56

Posted
Posted

Stock 5.3 piping is 2.75 or something right? 3" muffler is the way to go for us i think.

kennerz Enthusiast

kennerz

Posted
Posted

I guess what I'm wondering is if there is any true restriction at all. The flapper really seems like it would add some back pressure. Also factory resonators are not known for their performance benefit. I was thinking on a 6.2 a full 3.5 exhaust with a Magnaflow open core race muffler and no flapper or resonator should add something. Usually there is some scavaging effect with a properly designed exhaust. (even just a cat-back)

 

I agree that most mufflers are an exercise in sound cancellation and tuned audio effect and no performance. Only the race style mufflers really have a chance at more power. The spintech, flowmaster 40, etc have been dyno proven to not flow so well over some other designs (This was confirmed years ago on other sites I follow where inquiring minds looking for Max HP from a exhaust system/muffler tested most all the popular designs and found some of the tried and true and goto mufflers to really not flow very well, not trying to hurt feelings just been there done that where people took it to the real world to validate, not interwebs conjecture).

 

Would love to see a carven thrown in the mix as they are the new kid. Also there has to be a little meat on the bone if GM gives the Borla a 10+ HP rating over stock. A perfectly pieced together system may give 15+ and some Ft-LB over stock over the entire curve. Interesting to me as a person who likes to have stock stuff maximized with bolt ons and tuning, they always run better when it's well thought out.

 

BTW - Good Work ProModMike, great service to the community.

ProModMike Enthusiast

ProModMike

Posted
  • Author
Posted

Morning Gents,

 

Pesky day job strikes again. Not much I can do from offshore, lol. The guys at the shop told me they're going to finish the testing and video today. I already edited the content that was already done, so that should be ready. Once they finish, they'll put it in my drop box so I can post it.

 

In relation to the flapper valve creating backpressure, it absolutely does. Which, according to flow modeling and my calibrated ear, also increases the velocity and smooths the flow WHICH quiets it down. We haven't delved into the effects of the resonator yet, nor HP increase/decrease. 9.5/10 times we rearely see any noteable increase from a simple muffler swap in trucks or even most cars. The real gains happen when long tube headers and a tune come in, but that's already widely known. My 2011 Z06 gained 0HP on the dyno going from stock catback to a B&B PRT system. Just got MUCH louder. However, when we installed the long tubes, deleted the cats and tuned it, she picked up 44RWHP/32RWTQ with a super mild tune. Now of course, she's been stroked and has a .688 lift cam in in her, so she's gained a touch more, lol. But I digress.

 

Again, we were only attempting to mimick the GM Borla sound production. The 14" Magnaflow with the flapper valve in place, but clamped closed, and the resonator still installed was so silent, it was as quiet if not quieter than stock. No kidding. We clamped the valve open and then she started to speak. But still very quietly. Thus confirming our modeling output of the effect of the flapper valve. It's completely inaudible inside the truck all sealed up. Roll the windows down and turn off the radio, you can start to hear it. I would almost venture to say most of you would want a little more from it. We're going to play with aftermarket resonators soon to see what we can do.

 

Thanks for your patience!!

  • 2 weeks later...
  • 1 month later...
  • 2 weeks later...
Justin Nachazel Enthusiast

Justin Nachazel

Posted
Posted

Morning Gents,

 

Pesky day job strikes again. Not much I can do from offshore, lol. The guys at the shop told me they're going to finish the testing and video today. I already edited the content that was already done, so that should be ready. Once they finish, they'll put it in my drop box so I can post it.

 

In relation to the flapper valve creating backpressure, it absolutely does. Which, according to flow modeling and my calibrated ear, also increases the velocity and smooths the flow WHICH quiets it down. We haven't delved into the effects of the resonator yet, nor HP increase/decrease. 9.5/10 times we rearely see any noteable increase from a simple muffler swap in trucks or even most cars. The real gains happen when long tube headers and a tune come in, but that's already widely known. My 2011 Z06 gained 0HP on the dyno going from stock catback to a B&B PRT system. Just got MUCH louder. However, when we installed the long tubes, deleted the cats and tuned it, she picked up 44RWHP/32RWTQ with a super mild tune. Now of course, she's been stroked and has a .688 lift cam in in her, so she's gained a touch more, lol. But I digress.

 

Again, we were only attempting to mimick the GM Borla sound production. The 14" Magnaflow with the flapper valve in place, but clamped closed, and the resonator still installed was so silent, it was as quiet if not quieter than stock. No kidding. We clamped the valve open and then she started to speak. But still very quietly. Thus confirming our modeling output of the effect of the flapper valve. It's completely inaudible inside the truck all sealed up. Roll the windows down and turn off the radio, you can start to hear it. I would almost venture to say most of you would want a little more from it. We're going to play with aftermarket resonators soon to see what we can do.

 

Thanks for your patience!!

Has there been any update on this with a video at all? Thank you again!

 

 

Sent from my iPhone using Tapatalk

  • 1 month later...
hodges25 Enthusiast

hodges25

Posted
Posted

Morning Gents,

 

Pesky day job strikes again. Not much I can do from offshore, lol. The guys at the shop told me they're going to finish the testing and video today. I already edited the content that was already done, so that should be ready. Once they finish, they'll put it in my drop box so I can post it.

 

In relation to the flapper valve creating backpressure, it absolutely does. Which, according to flow modeling and my calibrated ear, also increases the velocity and smooths the flow WHICH quiets it down. We haven't delved into the effects of the resonator yet, nor HP increase/decrease. 9.5/10 times we rearely see any noteable increase from a simple muffler swap in trucks or even most cars. The real gains happen when long tube headers and a tune come in, but that's already widely known. My 2011 Z06 gained 0HP on the dyno going from stock catback to a B&B PRT system. Just got MUCH louder. However, when we installed the long tubes, deleted the cats and tuned it, she picked up 44RWHP/32RWTQ with a super mild tune. Now of course, she's been stroked and has a .688 lift cam in in her, so she's gained a touch more, lol. But I digress.

 

Again, we were only attempting to mimick the GM Borla sound production. The 14" Magnaflow with the flapper valve in place, but clamped closed, and the resonator still installed was so silent, it was as quiet if not quieter than stock. No kidding. We clamped the valve open and then she started to speak. But still very quietly. Thus confirming our modeling output of the effect of the flapper valve. It's completely inaudible inside the truck all sealed up. Roll the windows down and turn off the radio, you can start to hear it. I would almost venture to say most of you would want a little more from it. We're going to play with aftermarket resonators soon to see what we can do.

 

Thanks for your patience!!

Any updates with this ProModMike?

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