Jump to content

leave flapper valve or not

J_Mas6.2
 Share

Recommended Posts

tbarn Senior Enthusiast

tbarn

Posted
Posted

6.2 has noise cancelling does it not? maybe that's why you don't hear it.

Centex14 Enthusiast

Centex14

Posted
Posted
What muffler you have?
You wont hear it unless its in V4 mode and flapper can move freely. 

GM Borla. Had the v4 mode for two weeks before I tuned it. Never heard it.


2014 z71 LTZ
Volant Intake
Borla Exhaust
Diablo
Bilstein 5100
Rough Country Level
J_Mas6.2 Enthusiast

J_Mas6.2

Posted
  • Author
Posted
2 hours ago, GMC_SD_Ult_16 said:

I removed oem muffler, resonator, and valve and replaced with a 12909 Magnaflow on my 6.2L. Been super happy with sound and don't notice the annoying sounds described by others.

Sent from my SM-N950U using Tapatalk
 

This was the one i was going to go with, and last minute changed my mind and ordered a borla xr-1 sportsman p/n 40946.  planning to leave the resonator on and removing the flapper valve. Hoping this will add a nice little rumble to it.  planning on having my tune updated as well.

GMC_SD_Ult_16 Enthusiast

GMC_SD_Ult_16

Posted
Posted
6.2 has noise cancelling does it not? maybe that's why you don't hear it.
My noise cancelling is off due to my subwoofer install. So that is not it for me.

I have ridden around with out the system on as well to hear the sound. It produces the noise, to me, that it should for a 6.2L. You can tell when it is in v4 slightly but for me it is not much different than it sounded stock with light throttle and more aggressive with throttle near & over 2k rpm.

Sent from my SM-N950U using Tapatalk

Ed S Enthusiast

Ed S

Posted
Posted

I put a complete Borla cat back system on my 14 Sierra 5.3. System eliminates the flapper valve. Sounds great except when it goes into V4 mode. Borla claims absolutely no drone at any speed or rpm. Not true. Good luck to anyone that eliminates that flapper valve.

  • 10 months later...
Jose d New Member

Jose d

Posted
Posted

I have a 2015 Silverado 1500 5.3 removed muffler and resonator and “flapper” now it’s making a ticking noise what do you think it could be can someone help it’s driving me crazy had a flowmaster super ten single in dual out with turn downs 

Ozer Enthusiast

Ozer

Posted
Posted
9 hours ago, Jose d said:

I have a 2015 Silverado 1500 5.3 removed muffler and resonator and “flapper” now it’s making a ticking noise what do you think it could be can someone help it’s driving me crazy had a flowmaster super ten single in dual out with turn downs 

Ticking sound could be part of the exhaust hitting the frame. Check where the flex pipe goes over the frame, its a very tight space, if they didnt align it right it could be the issue.

  • 2 years later...
Isaiah2017 New Member

Isaiah2017

Posted
Posted
On 11/9/2018 at 10:38 AM, MN1(SW) said:

I removed my muffler and the valve and just welded a piece of pipe in their place. It sounded great to me and V4 really wasn't that noticeable. Not to me at least. If push comes to shove, you can always just leave it and lock it in the open position with some with some wire or something. If you don't like it, you can always close it. 

Will deleting the valve throw a code on dash ? 

reardiff Enthusiast

reardiff

Posted
Posted

While we're on the topic... is there any noticable difference  in performance, airflow, backpressure, MPG, etc.. with the flapper?  One would think anything inside the exhaust like this would impeed airflow.  

So other than sound, any benefits of removing it completely or forcing it open?  

16LT4 Enthusiast

16LT4

Posted
Posted

One of the main reasons I put a new catback system on my truck was to delete the flapper valve and its restriction; even wide open, the valve is a considerable bottle-neck to flow, along with introducing turbulence and friction to the exhaust flow.  For years, I'd been annoyed with the squeak every time the engine switched V8-V4 and back, and it got to the point where the valve was freezing shut, literally choking the engine and resulting in no power.

 

 

IMG_0698.jpg

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Software Update

      By Chuck FB · Posted

      I trust you saw the other comment where he knew what he was talking about !. Yes, these darned newer vehicles with all their so smart they are stupid technology, goes and drains the battery down. As you might see my other comment, I installed a Noco 5 battery tender under the hood and at this point still have the cord routed so I have to lift the hood and then plug it in but am typically parked in a garage or a shed so its not risking the engine hood in the wind. That way I am assured or hopefully so of not finding I have a battery drawn down and can't even start the truck and that also damages the battery to draw it down too far. 
    • Chuck FB
      Software Update

      By Chuck FB · Posted

      I guess no surprise my guesses were wrong !, at least now I know if I ever happen to see it grayed out in my own truck as to what is going on.    I never happened to catch my truck with it grayed out, it seemed every time I would test to see if there was an update it never found anything and yet more than once I would check to see if there was an update and there was nothing, then a day later or even that same morning I would drive to town and after more than one engine shut down in town as I did my errands it would pop up that there is an update now ready to install and the only place I have a connection to the internet is at home by wifi so its not as if it grabbed the download while driving. I don't trust these new vehicles due to all the crap they can decide to do while sitting for some days not running and run the battery down so most of the time if I know the truck will sit for a few days I plug in the battery tender I have mounted under the hood and so the only time the truck must have downloaded software was when it was sitting in the garage where the signal is awful but I have that tender plugged in and somehow it managed to download it. I honestly detest all this crap, way to easy to leave a person stranded.    Since I don't trust any of it I don't do the install of the already downloaded software until I get home and sometimes have even sat in the truck to watch what its doing as its going through the process to its conclusion as its not like it is set up that it will tell you the next time you fire up the engine that the update that was initialed actually installed or installed properly. Yes I can go into the updates and see the list. After I go through the install where I feel its safe to do so in case it breaks down as a result, I will plug in the battery tender after the fact to recharge as I don't know how much power its taking just to do the install and that can take a while for it to install. 
    • nfisherman
      Software Update

      By nfisherman · Posted

      Thanks for the reply. All settings were correct and the engine was off, as it was supposed to be. It turned out to be something simple. I took a drive for about an hour. I must have had a low battery without knowing it. The voltage gauge on the display looked ok. At the end of my drive, I shut off the engine and the update prompt came up and it updated normally. It’s ironic because one of the features of the update is a reduction of battery drain. 
    • kickass audio
      Software Update

      By kickass audio · Posted

      when it's greyed out that is it's way of telling you that it's downloading the patch in the background. Eventually it will be fully downloaded and then it will prompt you at ignition shut down to run the update. I highly recommend doing the update once you get home and can run it a few times. I've had several issues with updates not going the first time around and I had to retry the update multiple times in my driveway before it was successful.   Some updates are huge and take awhile to download. You can help it by connecting to your home WiFi and keep the truck on service mode for the ignition and keep it alive for awhile on a battery charger too. There are specs it needs to be in for updating such as a full enough battery charge, no running ignition, etc.
    • Chuck FB
      Software Update

      By Chuck FB · Posted

      I am not techy at all but wondered if you have the truck running but sitting still in park as some functions gray out as soon as the truck is moving. I believe in the settings for updates you can choose for it NOT to update and I wonder by chance if maybe that was chosen before and now it won't allow you to chose to press update, I think that is back in the settings menu where it has all the items one wants on or off etc. Also I assume you have a wifi connection and checked that it has some signal strength, not that it would have anything to do with the grayed out updates choice in that case. What I am thinking out loud of here may be be of no value but thought I would suggest it, sometimes it can be the simplest thing that resolves an issue.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...