Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Sign in to follow this  
FIREBLADE74

Adaptive flapper valve replacement

Recommended Posts

I just recently installed a 14” MF muffler dual exit on a 2017 Sierra 5.3. The first shop butchered the install so the 2nd shop had to remove my flapper to fix the butchering. 

 

Problem is when in v4 mode it sounds terrible other than that the exhaust sounds great. 

 

Ive searched gmparts but couldn’t find anything. 

Does anybody have a part # for this piece? The muffler shop said they’d weld it on free of charge if I found one. 

 

Thx!

Edited by FIREBLADE74

Share this post


Link to post
Share on other sites
On 11/25/2017 at 9:53 PM, FIREBLADE74 said:

I just recently installed a 14” MF muffler dual exit on a 2017 Sierra 5.3. The first shop butchered the install so the 2nd shop had to remove my flapper to fix the butchering. 

 

Problem is when in v4 mode it sounds terrible other than that the exhaust sounds great. 

 

Ive searched gmparts but couldn’t find anything. 

Does anybody have a part # for this piece? The muffler shop said they’d weld it on free of charge if I found one. 

 

Thx!

 

I'm not sure if this helps or not, but.....

flapper.JPG

Share this post


Link to post
Share on other sites

I don’t think it’s serviceable but thanks anyway

Share this post


Link to post
Share on other sites

I think I have a valve laying around. Give me a few days to find it     if you want it 

Share this post


Link to post
Share on other sites

Ill look for it this weekend 

Share this post


Link to post
Share on other sites

They will replace your exhaust if you are still under warranty.

I just got my truck back yesterday morning and it's cured.....at least for now.

 

Share this post


Link to post
Share on other sites
They will replace your exhaust if you are still under warranty.
I just got my truck back yesterday morning and it's cured.....at least for now.
 
They won't cover it because he got a MF installed and the shop who did the job butchered the flapper. It was not manufacture failure.

Sent from my SAMSUNG-SM-N920A using Tapatalk

Share this post


Link to post
Share on other sites
9 hours ago, Nasty said:

Ill look for it this weekend 

Thanks man!

Share this post


Link to post
Share on other sites
7 hours ago, ElJefeBlanco said:

They will replace your exhaust if you are still under warranty.

I just got my truck back yesterday morning and it's cured.....at least for now.

 

Like Siren said. I just want that chopper effect minimized. 

Share this post


Link to post
Share on other sites
On ‎11‎/‎25‎/‎2017 at 10:53 PM, FIREBLADE74 said:

I just recently installed a 14” MF muffler dual exit on a 2017 Sierra 5.3. The first shop butchered the install so the 2nd shop had to remove my flapper to fix the butchering. 

 

Problem is when in v4 mode it sounds terrible other than that the exhaust sounds great. 

 

Ive searched gmparts but couldn’t find anything. 

Does anybody have a part # for this piece? The muffler shop said they’d weld it on free of charge if I found one. 

 

Thx!

Disable AFM, it doesn't serve any purpose

Share this post


Link to post
Share on other sites
On 12/15/2017 at 7:44 AM, bgbdwlf2500 said:

Disable AFM, it doesn't serve any purpose

Don’t want to void my warranty, brand new truck. Performance is great it’s just that sound I don’t like. I wonder if the dealer would sell me a take off from somebody getting a catback? I kind of miss the quietness. 

Edited by FIREBLADE74

Share this post


Link to post
Share on other sites
On ‎12‎/‎16‎/‎2017 at 1:40 PM, FIREBLADE74 said:

Don’t want to void my warranty, brand new truck. Performance is great it’s just that sound I don’t like. I wonder if the dealer would sell me a take off from somebody getting a catback? I kind of miss the quietness. 

when I had a flowmaster put on (just the muffler) I didn't like how loud and noticeable the difference was when afm kicked in. then I saw the oil consumption issues posts and just went ahead and disabled it. look into the range module, if I'm not mistaken its not traceable and all it does is disable afm

Share this post


Link to post
Share on other sites

I think I’m just too old for the noise really lol. 

Share this post


Link to post
Share on other sites
1 hour ago, FIREBLADE74 said:

I think I’m just too old for the noise really lol. 

I don't like noisy either. But I am really happy with my setup.  All I did as a carven tr muffler.  No flapper and a kept the resonator nice little rumble but barely louder than stock. No drone or helicopter chop.  

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.