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The new exhaust flapper design

ShamrockShooter

By ShamrockShooter
in Engines & Drivetrain

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ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
Posted

It looks like GM redesigned the exhaust flapper on the 17. This picture is from a 5.3 l extended cab. It looks longer, has a beefier looking spring, and is now located in front of the muffler.

 

Anyone cut one off and see if it's different inside? Curious if they put a dampener on it so it wouldn't rattle like the first ones they made on 14 to 16s?4f231a3e994a32c66a4dd79b5da720ec.jpg

 

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Luster Senior Enthusiast

Luster

Posted
Posted

Interesting. Obviously an attempt to improve the dampening of V4 chop.

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted

Interesting. Obviously an attempt to improve the dampening of V4 chop.

But how the heck would one clamp it open?

 

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bdbake01 Senior Enthusiast

bdbake01

Posted
Posted

But how the heck would one clamp it open?

 

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Mig welder :)

powerhaulic Enthusiast

powerhaulic

Posted
Posted

My '17 6.2 flapper was still on the outlet.

But my muffler and tail pipe are not on the truck.....lol

dcheeseman Enthusiast

dcheeseman

Posted
Posted

It would be removed on mine, dual exhaust and ECM tuned to run on all 8 pistons 24/7 :driving:

 

Daniel

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted

I like the flexibility. Normally it's clamped open with range AFM to turn off v4. But if I'm driving on a family road trip I unclamp flapper and remove range for quiet v4 and better mpg.

 

My flapper has been rattling again so dealer is replacing it with the newer 17 exhaust under warranty. Guess I won't be clamping it open anymore.

 

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Luster Senior Enthusiast

Luster

Posted
Posted

My flapper has been rattling again so dealer is replacing it with the newer 17 exhaust under warranty.

 

Is your dealer replacing the entire exhaust under warranty? That seems excessive just one defective part.

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted

 

Is your dealer replacing the entire exhaust under warranty? That seems excessive just one defective part.

There is a bulletin from GM for the issue under warranty. There is no way to fix the rattle in the flapper without replacing the entire exhaust. Probably why they redesigned it for 2017. Yes it is a minor issue but I really don't give a damn. When you buy a 53k sticker vehicle you expect an exhaust that doesn't rattle. Even my kids heard the rattle and asked what the noise was under the truck. They thought it was chipmunks.

 

Of course this would become a moot point if I finally pull the trigger on a borla cat back or muffler swap.[emoji106]

 

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Luster Senior Enthusiast

Luster

Posted
Posted

There is a bulletin from GM for the issue under warranty. There is no way to fix the rattle in the flapper without replacing the entire exhaust. Probably why they redesigned it for 2017. Yes it is a minor issue but I really don't give a damn. When you buy a 53k sticker vehicle you expect an exhaust that doesn't rattle. Even my kids heard the rattle and asked what the noise was under the truck. They thought it was chipmunks.

 

Of course this would become a moot point if I finally pull the trigger on a borla cat back or muffler swap.[emoji106]

 

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I definitely agree, GM should fix. I never gave mine a chance to rattle. My first stop on my way home from the dealership was the EXHAUST SHOP!!! :lol::lol::lol:

dasimmon Enthusiast

dasimmon

Posted
Posted

There is a bulletin from GM for the issue under warranty. There is no way to fix the rattle in the flapper without replacing the entire exhaust. Probably why they redesigned it for 2017. Yes it is a minor issue but I really don't give a damn. When you buy a 53k sticker vehicle you expect an exhaust that doesn't rattle. Even my kids heard the rattle and asked what the noise was under the truck. They thought it was chipmunks.

 

Of course this would become a moot point if I finally pull the trigger on a borla cat back or muffler swap.[emoji106]

 

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amen!!!

BigBlueLB756 Senior Enthusiast

BigBlueLB756

Posted
Posted

That's the exact same valve I find on my 2016 Tahoe 5.3. No wonder I couldn't find a place to put the bolt through. GM caught on to that little trick being done by someone other than a GM "tech".

 

Oh, well!

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted

That's the exact same valve I find on my 2016 Tahoe 5.3. No wonder I couldn't find a place to put the bolt through. GM caught on to that little trick being done by someone other than a GM "tech".

 

Oh, well!

I think they underestimate the power of zip ties and duct tape.

1300c Enthusiast

1300c

Posted
Posted

They've changed the bypass on the new gm borla exhaust to go along with this new adaptive valve too.

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