Free Exhaust Mod!!

seth7843 · October 14, 2017

I just clamped mine open. I can finally hear my exhaust when idling! I love this mod. No more sewing machine sound from a 6.2l

BlackHawkZ71 · October 18, 2017

I do know the 17 chevys are a lot different with that flapper mine currently has a bolt through it (i had laying around) last time i checked? Not sure if its still there??

I decided to leave that flapper in place when i got my flowmaster put on ($160 muffler+welding) and res delete

now I wish I would have had them cut the flapper off, truck is a lot better sounding and a little louder at idle, drone isnt bad on the highway only when i am accelerating in V4 mode.

SirenRed16 · October 18, 2017

I do know the 17 chevys are a lot different with that flapper mine currently has a bolt through it (i had laying around) last time i checked? Not sure if its still there??

I decided to leave that flapper in place when i got my flowmaster put on ($160 muffler+welding) and res delete

now I wish I would have had them cut the flapper off, truck is a lot better sounding and a little louder at idle, drone isnt bad on the highway only when i am accelerating in V4 mode.

It's still not to late you can go back and have them remove it. If they are nice enough people they might not charge you .

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BlackHawkZ71 · October 18, 2017

6 minutes ago, SirenRed16 said:

It's still not to late you can go back and have them remove it. If they are nice enough people they might not charge you .

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Would be nice. But i had this setup for a long time i think since last November? Last time i tried to get them to clamp my res on in place of flowmaster to see what I thought vs paying money to have it welded then cutoff and flowmaster re welded if I didn’t like it.. they didn’t like the idea of clamps

SirenRed16 · October 18, 2017

Would be nice. But i had this setup for a long time i think since last November? Last time i tried to get them to clamp my res on in place of flowmaster to see what I thought vs paying money to have it welded then cutoff and flowmaster re welded if I didn’t like it.. they didn’t like the idea of clamps

I see, when I got my exhaust done i removed flapper and resonator first time around. Only problem now is I want something louder.

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Hunter11 · October 18, 2017

I had the flapper valve removed on my wife's 17 the first week we got it. The sound is a deeper tone that she is happy with. If you look at that valve in the pipe even in the open position it is still a big restriction in the system.

steve76t · October 28, 2017

did they change the design of the flapper on the 17s? I've see pics of others, such as on page one of this thread, that show a square looking cap tot the spring. The one on my 17 Sierra Denali is round & can't figure out how others have "bolted" theirs open. Any pics of the bolt location?

SirenRed16 · October 28, 2017

did they change the design of the flapper on the 17s? I've see pics of others, such as on page one of this thread, that show a square looking cap tot the spring. The one on my 17 Sierra Denali is round & can't figure out how others have "bolted" theirs open. Any pics of the bolt location?

Yeah I believe they changed it a bit. On the 16 it was behind the muffler and on the 17 it's in front of the muffler.

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steve76t · October 28, 2017

that's what I thought. yes, mine is in front of the muffler. I think I could use a wire to tie it off & keep it open. However, with it in front of the muffler it may not make much difference. My issue is that it does rattle a little bit, especially at idle.

Edited October 28, 2017 by steve76t

Largely Unknown · October 31, 2017

Mine is round as well (2017 5.3, two weeks old). I tried a little WD40 (helped a little, changed it from a screech to a chirp). I'm curious how you remove it, since I assume there is a piece inside the pipe?

I'm always in traffic, so its constantly sounding off, but I could live with it if I had to.

FAST380 · November 5, 2017

So does wiring open on the 17's help? This is the first I have read about it, might have to try.

Scuba78 · November 9, 2017

Mine Chirped bad, dealer replaced the entire exhaust with only 5k miles! i tried to get them to swap it for my choice, but no go.. I will do a mod soon. curious if anyone has tried just getting rid of the resonator.

steve76t · November 10, 2017

On 11/5/2017 at 9:59 AM, FAST380 said:

So does wiring open on the 17's help? This is the first I have read about it, might have to try.

don't know if it'll help or not. I'm thinking trying it just to see if there's any difference.

FAST380 · November 10, 2017

I did mine. 2017 All Terrain with 6.2L. It was the square style after the muffler. Made a difference, a very little difference, but might be just enough for me. For the 2 minutes it took, it isn't worth trying to discribe, just do it and see what you think. Louder on downhill deceleration. Has a little rumble it never had before. Try it.