Jump to content

Exhaust Flapper , mod?

DaveHC
 Share

Recommended Posts

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
  • Sad 1
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? 

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

    342,972
    Total Members
    8,960
    Most Online
    Whit.the.COB
    Newest Member
    Whit.the.COB
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,201 Guests (See full list)

  • Latest Articles

  • Posts

    • MikeBMW
      Installing tow mirrors

      By MikeBMW · Posted

      Yep! This should be a pin somewhere as @pgamboa really dives into all of this. Thanks for reposting the link!
    • Grumpy Bear
      TCM Tuning 6L80E

      By Grumpy Bear · Posted

      I did the new thermostat after doing a 'flip' for a year. Runs as cool one way as the other in the summer but in the winter there is a bit of a floor. Yellow with the new 70 C thermostat. My data over the life of the unit to date. Still need more cooler. Anyway that floor helped both winter fuel economy and shift quality in the winter. I found it a good balance.       
    • Grumpy Bear
      Food & Drink

      By Grumpy Bear · Posted

      Evan Williams Bottled in Bond   So pouring the last of a bottle of Evan Williams Black label last night I set off the the state store for a refill only to be denied the by an empty shelf. Rats.    What the did have was a bottle of Evan Williams Bottled in Bond. 100 proof. Hum, a few bucks more but a known distiller. Lets have a swing at it. ( I have before )    Cracked it open and pour a serving over ice. Hum.... more heat, yes. More alcohol naturally. But the barreling not the proof brings the taste and this one came up short.    Oh is was familiar but the heat ran the barrel over like a Peterbilt runs over a squirrel. Could use a heavier toasting of the oak me thinks or perhaps a longer barreling. Who knows. But what I can say is ice or a water back isn't the answer. What kills one kills them both. Sad. It is a pleasant drink....if you have little to compare it to.  
    • Grumpy Bear
      Bridgestone vs Goodyear tires?

      By Grumpy Bear · Posted

      I've had exactly one set of Bridgestone. Lasted five year and 125,000 miles and had I known better 15oK would have been a cake walk. I would have bought a like set had they not tripled in price since the first set. I removed them at said mileage with 5/32" remaining in dead even wear all four. They were fuel efficient, quite, comfortable and predictable.    Early on I got a very good alignment checked at least once a year, sometimes twice; kept the tires properly inflated, balanced and rotated. And I've found that many a tire issue can be avoided with great maintenance practices. Lot's of tire dealers will do rotation and balance (simple) for free for as long as you own the tire they sold you so no excuse not to.    Bead prep, alloy integrity and stem health have a huge impact on inflation stability. There are more mountings done poorly that perfectly. Finding a good tire guy is gold and as important as finding a tire you like.    That 3X price increase now two sets of "other tires' later is starting look like a bargain.      Bad maintenance kills more tires than bad tires. 
    • Grumpy Bear
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Grumpy Bear · Posted

      Atlas, you kill me As aggravating as a project like this can be you have been unable to hide your fascination with learning and using that angst against this beast like a Ninjitsu Master. It amuses you, admit it now.      BTW, love your writing style. 😉       

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...