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Exhaust Flapper , mod?

DaveHC
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SquireSCA Enthusiast

SquireSCA

Posted
Posted

Maybe the DFM on the 5.3 sounds different than on the 6.2?  Mine, you can hear it,  but it is very subtle and doesn't sound like a helicopter...

  • 4 weeks later...
Scooter Scott Enthusiast

Scooter Scott

Posted
Posted

This is a great question that I am looking for an answer too.  I have a 2019 6.2 and have held off to see what others are experiencing.  People don't understand the mesh screens aren't on the 6.2 but keep commenting on threads about 6.2s on how to fix them....

MG386 Enthusiast

MG386

Posted
Posted

I have the 6.2 and the GM Cat back. I don't understand what people are talking about with this helicopter sound. I've driven 40-50 and all speeds windows up/down everything, and I can't get it to make any abnormal sound.

I'm just curious because I kept both my resonators just in case I need to put them back on to quiet it down, but I don't hear anything.

Are you towing while doing this?

Sent from my Pixel 4 XL using Tapatalk

DaveHC Enthusiast

DaveHC

Posted
  • Author
Posted (edited)
On 12/29/2019 at 5:15 PM, Londart2020 said:

I have the DFM too, and the heli sound come from when goes to two or less cylinders. Anybody have any input on getting these put back on?

from what I have read, resonators handle the drone, cans on 6.2 and screens on 5.3 do the same job of cancelling it out on the stock exhaust, most cat backs don't have them and many say no drone so not sure how it works on them.

Edited by DaveHC
Texasdeere Enthusiast

Texasdeere

Posted
Posted (edited)

 

Interested in seeing how this sounds on my truck when disabled

 

 

Edited by Texasdeere
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Dick Messerly Enthusiast

Dick Messerly

Posted
Posted
On 12/28/2019 at 4:33 PM, michael betz said:

Best mod ever.  Love it. Highly recommend the Borla atak. No drone. Perfect sound. Not too loud ,not quiet. Perfect 

Had the ATAK on my 2017 5.3L and I truly miss it. Did you just throw the ATAK muffler on or is it the whole system? If it's just the muffler where did you get it at I asked borla and they told me they wouldn't sell the muffler only. 

Texasdeere Enthusiast

Texasdeere

Posted
Posted

Flapper pinned open, stock 5.3 single exhaust so far maybe a 5% increase in sound.  No undesirable noises.  Going to put some miles on it to make sure.

  • 11 months later...
JohnH4260 Enthusiast

JohnH4260

Posted
Posted
On 2/2/2020 at 12:51 PM, Texasdeere said:

Flapper pinned open, stock 5.3 single exhaust so far maybe a 5% increase in sound.  No undesirable noises.  Going to put some miles on it to make sure.

How did you pin the flapper valve open? Thanks.

Texasdeere Enthusiast

Texasdeere

Posted
Posted

I just used a metal hose clamp but that looks way more professional!

 

Looking back it was more like a 10% increase in sound. Quite noticeable on cold start up.  You could hear it more when you "got on it"  Just right for me.

  • 4 years later...
SilveradoVictory Enthusiast

SilveradoVictory

Posted
Posted

Any noticeable change in fuel use or power? I would think that opening the valve would allow the exhaust gasses to flow more easily and therefore more efficiently clear out the cylinders on the exhaust stroke.  Does moving those gasses quicker increase the mileage or the horsepower? 

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    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      Thanks for all that information, I might purchase one and see if it will work for me, if not they may let me return it! Yes for sure the tires are definitely within limit for my truck empty, and when I do tow I'll definitely make sure to raise the rear psi for the amount of weight that's going to be on it.
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Yes exactly, more and more these days people/companies are afraid of liability issues so its easier just to say no rather than risk putting their neck on the line.    I will say with the Autel unit or when I used it last year on my truck, it wasn't like I could choose the 2025 model year or even the 2024 model year as that option was not there to manipulate the placard pressures but had to go back to 2023 or there abouts and then it showed up as an option, odd but that was how the software was then and I can't say one way or the other now as they throw out updates every so often. I still would talk to your tire dealer though to start with and they may do it for nothing but also they may have a comment on a better unit to purchase. All I know is that one of the large tire shops in my area happens to use these Autel units for their use and set them up to use the wifi and all of that jazz for constant updating because each tire tech has one handed to them by the shop but I just plugged it into my laptop to update it and yes if one is bought it has to be registered so you can get the link to do updates and then the unit has to be updated before its even used. I am not at all techy so it took me a bit but anyway just a heads up for anything you buy, most likely it will need to be connected to a computer to access the internet to have it updated to the latest software version before you can put it to use.   If your truck is near empty, those tire pressures you listed are a very safe upper range pressures to carry the weight, both the front and rear as I know they could be run lower yet with an empty truck. And if its a trailer and not some motorcycle your going to strap onto the front of your truck on a rack, you shouldn't have a need to inflate your front tires if your at 55 front already, its the rear ones that would need more air if you have much hitch weight. 
    • jgaudet99
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      Thank you, I'll check that Autel scanner out and see if it will work for me! Ya I can see GM's point of view if they lower the psi set value for someone and the person sell's the truck and the new owner puts the factory tires back on then their could be liability issues cause the psi warning light wasn't coming on when the tires were under inflated for towing their load and then it might be able to be traced back to GM lowering it.
    • Chuck FB
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      By Chuck FB · Posted

      I had a similar but different response when I talked to the service manager where I bought my truck in that he said GM corporate won't allow them to lower the placard pressure setting as they would get their hand slapped but that of course they have the ability to make that change. His suggestion was simply go to a tire dealer or third party shop that is willing to reset the pressures lower. However I chose to buy a tpms tool and partly based off of this very forum as it had been proven to work on the 2024 model ( Global B system ) and while I could have paid lots for a full two way diag tool, I didn't want to spend that much and bought the recommended Autel TS 508 and it will reprogram the 2025 model and assume it should do the 2026 as well. However the tool is rather proprietary to reprogramming Autel tpms sensors so that is a function I will never use, where as a real two way scanner would have many uses but also have yearly subscriptions etc where this 508 is free updates for as long as they put updates out for the unit. In any event it worked to lower the placard pressures and I often use it to adjust my actual tire pressures although will check with a mechanical gauge as well sometimes just to make sure that tires tpms sensor isn't lying to me.    My suggestion is either buy a tool that you know will work to adjust the system or start out by getting the tire shop you bought your tires from to reset your truck and if after that you still want a unit to do it yourself, get one at that point. 
    • jgaudet99
      Tire psi

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      Here is an image of a quick Google search about these tires on my truck and it's exactly same psi recommendation the Toyo tires company gave me!    I'm not looking for anyone else recommended psi or anything, I'm just looking to see if anyone knew a way to get rid of the factory low psi warning light, because I'm not running high psi and ruining my tires when I'm not towing! 

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