Jump to content

$20 Exhaust Fix 2019 5.3 z71

ShamrockShooter
 Share

Recommended Posts

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
Posted

Clamped open flapper and covered all 6 exhaust screens. Cost me less than $20 at home depot. The exhaust screens first didn't do that much. Clamping open the flapper seemed to make the most difference.

 

Side note. Check your flapper. Mine appeared to stuck and didn't want to open and close freely until I rotated it by hand several times.

 

I would say it is now one notch below the borla touring I had on my 16 z71 5.3.

 

I was also surprised with the flapper clamped open, I really didn't defect any of the helicopter noise I used to get on the 16 5.3 truck I had in V4. I do have duratacs for tires so maybe it does helicopter a little bit and I just don't hear it.

 

I also like that it doesn't make a whistling noise as the air moves past the flapper valve that I used to hear when I had my back window open and stomped on it.

 

I think the exhaust sounds just right now. Not quite hey look at me loud, it sounds like a real v8 now. Especially on a cold start. And if you don't like, I can put it back to stock in less than 5 minutes.678d8cbe5dc4279ba2fd6f01dac251f6.jpg497625ce0e13f2137e5e89171bf6cbeb.jpg

 

Sent from my Pixel 2 using Tapatalk

 

 

  • Like 3
  • Replies 199
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

econometrics
econometrics

If we could hand out trophies on the internet, we would most certainly give you one. 

Dmart
Dmart

Exhaust Mod:Frio Edition.  dB levels were captured before and after mod in same place. Flapper open.

Thejet07
Thejet07

So then don’t do it and be on your merry way. Some people like it some don’t. It does change the tone for the better IMO. Carry on Sent from my iPhone using Tapatalk

Posted Images

eppieguy Senior Enthusiast

eppieguy

Posted
Posted

Great Review! I just wish it was that easy for the 6.2! :(

Ozer Enthusiast

Ozer

Posted
Posted

The helicopter noise is more noticeable when you have an aftermarket muffler vs stock.  

TB3546 Enthusiast

TB3546

Posted
Posted

Isn't there two flapper valves? One in front of the muffler, one after? 

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted
Isn't there two flapper valves? One in front of the muffler, one after? 
5.3 has 1. I have heard 6.2 has one on either side.

Sent from my Pixel 2 using Tapatalk

  • Like 1
TB3546 Enthusiast

TB3546

Posted
Posted
2 hours ago, ShamrockShooter said:

5.3 has 1. I have heard 6.2 has one on either side.

Sent from my Pixel 2 using Tapatalk
 

I did this to mine tonight and it seemed to have some more rumble. I will look forward to the cold start in the morning. I'm guessing the flapper valve is open when turned clockwise? 

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted
I did this to mine tonight and it seemed to have some more rumble. I will look forward to the cold start in the morning. I'm guessing the flapper valve is open when turned clockwise? 
I don't recall which way they turn. I just look at the spring, you can see it compressing and getting tighter, that is the direction to rotate it.

It's not an earth shattering difference but it is just enough to keep me from wanting shell out over a grand for a bolt on system or chopping up the pipes for a cut out or muffler delete

Sent from my Pixel 2 using Tapatalk

  • Like 1
ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted
I did this to mine tonight and it seemed to have some more rumble. I will look forward to the cold start in the morning. I'm guessing the flapper valve is open when turned clockwise? 
How was the cold start?

Sent from my Pixel 2 using Tapatalk

ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted

I gave it the mustard pulling out of work yesterday, and this morning a co-worker asked me what aftermarket exhaust I put on my truck. Guess it must sound louder outside too.

Sent from my Pixel 2 using Tapatalk

  • Like 1
asalinasz39 Enthusiast

asalinasz39

Posted
Posted (edited)
17 hours ago, ShamrockShooter said:

I gave it the mustard pulling out of work yesterday, and this morning a co-worker asked me what aftermarket exhaust I put on my truck. Guess it must sound louder outside too.

Sent from my Pixel 2 using Tapatalk
 

What sheet metal did you use to cover the resonator screens?

Also what size were the clamps you used for the valve?

 

 

Edit: just read the response on another thread :) 

took a pic and heading to HomeDepot this afternoon.

Edited by asalinasz39
ShamrockShooter Senior Enthusiast

ShamrockShooter

Posted
  • Author
Posted
What sheet metal did you use to cover the resonator screens?
Also what size were the clamps you used for the valve?
You could use beer cans probably but I just grabbed a piece of galvanized sheet metal from the HVAC ductwork section at home Depot. It was maybe 2ft x 3 ft cost $7. It was the smallest piece they had that was flat.

I don't remember what size clamps I used for the flapper as I had a few of those on hand. Just measure the diameter of the round knob on the flapper and add a half inch to get the clamp size. I got a flat galvanized rectangular bracket from the hardware section to go between the two clamps on the flapper.

Sent from my Pixel 2 using Tapatalk

asalinasz39 Enthusiast

asalinasz39

Posted
Posted
1 minute ago, ShamrockShooter said:

You could use beer cans probably but I just grabbed a piece of galvanized sheet metal from the HVAC ductwork section at home Depot. It was maybe 2ft x 3 ft cost $7. It was the smallest piece they had that was flat.

I don't remember what size clamps I used for the flapper as I had a few of those on hand. Just measure the diameter of the round knob on the flapper and add a half inch to get the clamp size. I got a flat galvanized rectangular bracket from the hardware section to go between the two clamps on the flapper.

Sent from my Pixel 2 using Tapatalk
 

Thanks! I did notice the rectangular bracket.  I have a piece of that laying around in the garage. I am a hoarder lol

I had read before on people use exhaust tape to cover the mesh screens and that was going to be my original go to...but I was too lazy to stop by an auto parts. This method however has me motivated especially with the results you achieved. I had previously tried clamping only the flapper valve and noticed no difference but with the screens covered I am looking forward to the new rumble. 

TB3546 Enthusiast

TB3546

Posted
Posted
On 6/19/2019 at 8:56 AM, ShamrockShooter said:

How was the cold start?

Sent from my Pixel 2 using Tapatalk
 

It's hard to judge it cause I forgot to take a before and after cold start video..

TB3546 Enthusiast

TB3546

Posted
Posted
4 hours ago, asalinasz39 said:

Thanks! I did notice the rectangular bracket.  I have a piece of that laying around in the garage. I am a hoarder lol

I had read before on people use exhaust tape to cover the mesh screens and that was going to be my original go to...but I was too lazy to stop by an auto parts. This method however has me motivated especially with the results you achieved. I had previously tried clamping only the flapper valve and noticed no difference but with the screens covered I am looking forward to the new rumble. 

Please do us a favor and do a before and after cold start! 

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

    342,965
    Total Members
    8,960
    Most Online
    DaleB
    Newest Member
    DaleB
    Joined

  • Who's Online   4 Members, 0 Anonymous, 1,414 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Common Sense Assembly   Your driveline is forgiving of the occasional mistake. It will even often forgive the random serious blunder. But it will not forgive a continuous bad habit.      What? Not everything needs to be a five thousand word essay.       
    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      We drove about 15 minute east today to visit a friend and saw a steep increase in price in the same county. About 50 cents a gallon steepper. 
    • Grumpy Bear
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Grumpy Bear · Posted

      Sure about that? A degree wheel and a dial indicator would lower your degree of assurance in that statement. 😉    It why we have offset keys and dialable timing sprockets. Just say'n.... I've built a few and have never seen one "On the money". 
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I will admit I haven't experimented much with pressure drops beyond the numbers I put in and part of that is that the numbers I used are fairly low and then found out it would trigger regardless at that 35 psi. Having said that I had tried before had changed the placard pressures and being that I have a 1 ton set to 80 on the placard for the rear I believe it triggered close to 60, the front I don't recall now for sure but thought maybe it could get close to 45 from that factory 60 placard pressure. So I never did figure out if it was a number of psi from placard pressure to the alarm or a percentage of the total placard number as some figured it was like a 25% drop from placard pressure would trigger it. So as to try and answer your question, I believe I set the placard pressure on the front to 47 or so and while I run the front tires at 40, they have dipped below that some if its colder and I haven't put "winter air" in yet and never once have had the front alarm go off. I would say that the answer your looking for is no, that if you set your placard pressure to 45, you have a certain amount of room to drop below that pressure before the alarm will go off.    The pressures you decide to run in your truck, that ends up being what makes sense to you based on what your carrying in your truck or if towing, then have to bump them back up to something that will carry the load in the rear and the fronts typically left at the same pressure. It all comes down to that chart I put the link to and using an accurate roadside scale to be your guide, both unloaded and then loaded to know your minimum safe pressures.    I just wish GM would allow a person to change the readings for the tire pressures to the English system of pounds as I have to look at that goofy metric reading that will never ever jive in my head and will go over and change it just to figure out what they are if need be and then change it back. 
    • TrueBlue
      No Software Updates - Old Build

      By TrueBlue · Posted

      That part I understand, that the dealer can do it. But I'm not understanding why updates that were available to the truck since it left the factory, or the dealership originally, would not still be available to it without dealer intervention.   I'm thinking along the lines of recalls. They stay available until they are completed, regardless of whether they are in warranty or not, or in the hands of the original owner or not. Why not updates as well, especially since some of those can be safety related also?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...