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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,881
    Total Members
    8,960
    Most Online
    tararebecca
    Newest Member
    tararebecca
    Joined

  • Who's Online   2 Members, 1 Anonymous, 521 Guests (See full list)

  • Latest Articles

  • Posts

    • tararebecca
      2027 GMC Sierra: Official Discussion

      By tararebecca · Posted

      I agree, simplicity and reliability matter more as vehicles get more complicated. A V8 work truck option with fewer electronic features and a stronger warranty would definitely appeal to a lot of buyers who use their trucks for real work. Customizing it with trusted outfitters is often the best way to get exactly what you need
    • artistemorbidity
      2026 Sierra 1500 Denali - Sound upgrade?

      By artistemorbidity · Posted

      I’ve heard similar complaints from newer vehicles where the factory “premium” systems don’t always live up to expectations. A good installer should be able to improve the sound without turning it into a bass-heavy setup. I’d look into upgrading the front speakers, adding a quality DSP amplifier, and possibly improving sound deadening first—those changes usually make a much bigger difference than just adding a subwoofer. Hopefully someone local can recommend a reputable installer in the Las Vegas/St. George area.
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      Do you remember that Harley Davidson was more successful (solvent) when it produced about 60% of the market demand (by design) and forced wait times of up to three years? Even when your turn came around it was, "Take what we are giving you or move to the back of the line and start over". HUGE markup's were 'normalized' and dealer killed. 40% markup and no floor plan? What's not to love? Greed will kill them yet. They have surplus production and customer base is tanking. And still they think nosebleed pricing will work.  
    • newdude
      Me too……..

      By newdude · Posted

      The engine was done as part of the 6.2 recall?   You'd have to see if your VIN also has the 6.2 engine special coverage on it.  Coverage number is N252494003.  If you have this, your engine is covered under this and NOT the GM replacement part engine warranty which is 3yr/100k from the date of install.  The 3yr/100k mi warranty is in effect for non warranty purchases.     This is not any different if it was replaced under warranty without a recall or special coverage.  So if you had a 5.3 and it popped at 3 years in at 50,000mi during the 5yr/60k powertrain, the replacement engine would not get the 3yr/100k, and instead gets the remainder of the 5yr/60k as coverage.     So N252494003 gives 10 years or 150,000mi of coverage, which ever comes first, starting at the vehicle in service date.  So if your in service date is 01/01/2022, N252494003 gives you special coverage of the engine until 01/01/2032 or 150,000mi, whichever comes first.  So if your start date was 01/01/2022, you'd have left 5 years and 4 months (lets round to august 1st), or 62,000mi left of coverage.   So you need to know your in service date to know how much coverage is left.  
    • CamGTP
      Injector update

      By CamGTP · Posted

      Okiee dokie there bud, way to take things to the extreme.   I guess you missed the whole point and take things way to serious. I installed different EV6 style injectors that just so happen to be larger in my car running the same LQ4 engine and with a better spray pattern than the stock style injectors and I noticed no difference in the idle quality. Kinda was my round about way of saying that even if you put the same size but better style injectors in your truck, you will likely see the same thing.    I'm sure you're great to have conversations with in person if that's how you act through a keyboard. One little things sets you off and now I guess my dick is all up in your face.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...