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Muffler Delete Flapper Question

tjd2003

By tjd2003
in Engines & Drivetrain

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tjd2003 Enthusiast

tjd2003

Posted
Posted

Hello all. I'm planning on doing the muffler delete very soon and I'm debating whether I should remove the flapper too or just clamp it open. I'll be using the Range AFM module so no V4 to worry about. What's everyone's opinion on this?

emeryz28 Enthusiast

emeryz28

Posted
Posted

if you have the V4 mode tuned out, then remove the flapper. If you do not, leave flapper.

  • Like 2
GMC_SD_Ult_16 Enthusiast

GMC_SD_Ult_16

Posted
Posted

I just went through the muffler delete process. For me it sounded good/deep but it was loud with flapper clamped open and any accleration. On idle it had a good clean rumble. The unclamped flapper made a strange flutter sound so I had to remove. It was loud enough my wife and neighbors could hear me come from slightly down the street and on highway you definitely had more cabin rumble noise even without v4. So I removed flapper and resonator also and added back in a Magnaflow 12909 22" muffler. This seems to be more my style. Nice low growl, calm in the neighborhood, but nice when you lay into it, I barely have any v4 chopper noise with this setup. Everyone on this forum has a different level of what is acceptable sound and for some it will never be loud enough. To note as well I have an AFE CAI on the truck and feel it does add to the sound as well. Keep that in mind if you plan to upgrade your intake as well. Good luck on finding your sound.

 

Sent from my Note 5 using Tapatalk

Crstfr Enthusiast

Crstfr

Posted
Posted (edited)

"Everyone on this forum has a different level of what is acceptable sound and for some it will never be loud enough."...

 

 

Well said GMC_SD!...

Edited by Crstfr
  • Like 1
tjd2003 Enthusiast

tjd2003

Posted
  • Author
Posted

Had it done this morning. Had them remove the muffler and flapper and left everything else the way it was. Sounds amazing in my opinion! It's exactly what I was looking for. Thanks everyone for the input.

15_silverado Enthusiast

15_silverado

Posted
Posted

Had it done this morning. Had them remove the muffler and flapper and left everything else the way it was. Sounds amazing in my opinion! It's exactly what I was looking for. Thanks everyone for the input.

You should post a video so we can hear it?

  • Like 1
tjd2003 Enthusiast

tjd2003

Posted
  • Author
Posted

I did leave the resonator. Removed the muffler and flapper and put a straight pipe in place of them. I can't say enough how much I am pleased with this. I'll try to get a video up soon.

Kens16Denali Enthusiast

Kens16Denali

Posted
Posted

I did leave the resonator. Removed the muffler and flapper and put a straight pipe in place of them. I can't say enough how much I am pleased with this. I'll try to get a video up soon.

 

How is the interior sound? how about when it switches to v4?

Barbarrino Enthusiast

Barbarrino

Posted
Posted

if you have the V4 mode tuned out, then remove the flapper. If you do not, leave flapper.

 

Bam. Lock the thread haha.

 

My friend owns a muffler shop so I tried 4 different configurations and this is 10000% accurate.

tjd2003 Enthusiast

tjd2003

Posted
  • Author
Posted

 

Bam. Lock the thread haha.

 

My friend owns a muffler shop so I tried 4 different configurations and this is 10000% accurate.

 

This is true!

tjd2003 Enthusiast

tjd2003

Posted
  • Author
Posted

 

How is the interior sound? how about when it switches to v4?

Interior sound is mild. It sounds about the same as the stock exhaust on my wife's 07 Yukon Denali with the 6.2. For some reason GM decided these newer vehicles needed to be quiet. I felt like I needed to undo that haha. Under normal driving its barely louder than stock inside. Under acceleration you can definitely hear it. I installed the Range AFM module to turn the V4 mode off. When it switched to V4 it sounded terrible, but I removed the flapper with mine as well.

  • 3 weeks later...
Brant78 Enthusiast

Brant78

Posted
Posted

video please!!!

Yes please post a video!

 

 

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