Stock muffler

[Musky Mike]

Has anyone cut open a 5 Gen stock muffler?

 

[pacofortacos]

Purpose of doing this? What are you hoping to see?

 

[Musky Mike]

Purpose of doing this? What are you hoping to see?

Just want to see.

 

[pacofortacos]

The 6.4 muffler is a little different, in the fact that it has a flapper in it.
But the 5.7 is, I would have to guess, just like every other chambered muffler.

We will await your pics after you cut it open

 

[Musky Mike]

The 6.4 muffler is a little different, in the fact that it has a flapper in it.
But the 5.7 is, I would have to guess, just like every other chambered muffler.

We will await your pics after you cut it open

What does the flapper do?

 

[pacofortacos]

Makes it very quiet

It may create a little bit of a restriction at low flow for maybe a bit of backpressure - but this is just guessing.

When a STOCK 6.4 hemi (3.5" diameter) muffler and tailpipe are installed on a 5.7 hemi (3" diameter), it is whisper quiet - almost stealthy lol

 

[Musky Mike]

Makes it very quiet

It may create a little bit of a restriction at low flow for maybe a bit of backpressure - but this is just guessing.

When a STOCK 6.4 hemi (3.5" diameter) muffler and tailpipe are installed on a 5.7 hemi (3" diameter), it is whisper quiet - almost stealthy lol

So quiet at idle and loud when get on it?

 

[Tim Garceau]

The 5th Gen 5.7s now have a weep holes in both resonators, makes aftermarket mufflers sound like there's a leak. I would absolutely weld it shut or remove the resonators all together.

Otherwise, pretty standard 40" chambered muffler tuned for MDS like the 4th Gens.

 

[TheKenster]

The 5th Gen 5.7s now have a weep holes in both resonators, makes aftermarket mufflers sound like there's a leak. I would absolutely weld it shut or remove the resonators all together.

Otherwise, pretty standard 40" chambered muffler tuned for MDS like the 4th Gens.

I didn't know that. That explains why my magna sounds strange at idle if you listen near the tailpipes.

Sent from my SM-N950U using Tapatalk

 

[2016Bighorny]

Has anyone cut open the stock muffler?

here you go...

 

[Musky Mike]

here you go...

No packing? Looks like a 4 Gen, 5 Gen only has one outlet. Thank you.

 

[2016Bighorny]

No packing? Looks like a 4 Gen, 5 Gen only has one outlet. Thank you.

Ahhh ****!... sorry, I did not notice the 5th gen part...

 

[pacofortacos]

So quiet at idle and loud when get on it?

Not with a 5.7 - at least. Quiet all of the time

 

[pacofortacos]

No 5th gen's have the bumper twin tailpipe outlets any longer??

Muffler design is most likely still similar to the 4th gen. My 4th gen is single in and single out.

 

[Bowler807]

Someone asked about the flapper in the muffler of the 6.4. My E36 BMW has a flapper also. It is located in one of the muffler outlets. It operates on vacuum, and was placed there for a boost in low end torque. Sounds strange, but it works. I blocked mine open for a while. I had significantly reduced low end "pull". Once I re-connected it the car ran very nicely again. I suspect the 6.4 uses it for the same reason.

 

[Musky Mike]

No 5th gen's have the bumper twin tailpipe outlets any longer??

Muffler design is most likely still similar to the 4th gen. My 4th gen is single in and single out.

Depends on the model, some have a single tail pipe and some have the dual tail pipes. On pre 2019s the muffler was single in dual out, (excluding single tail pipe models) on 2019s dual tail pipes, it is single in, single out with Y pipe making it dual tail pipes.

 

[Fatbob Frank]

Depends on the model, some have a single tail pipe and some have the dual tail pipes. On pre 2019s the muffler was single in dual out, (excluding single tail pipe models) on 2019s dual tail pipes, it is single in, single out with Y pipe making it dual tail pipes.

And I for one thank them for changing it!
Makes it much easier swapping that huge pig out for something better...

 

[pacofortacos]

Depends on the model, some have a single tail pipe and some have the dual tail pipes. On pre 2019s the muffler was single in dual out, (excluding single tail pipe models) on 2019s dual tail pipes, it is single in, single out with Y pipe making it dual tail pipes.

Ok, I haven't been under any 5th gens yet. thanks

 

[Tim Garceau]

I didn't know that. That explains why my magna sounds strange at idle if you listen near the tailpipes.

Sent from my SM-N950U using Tapatalk

Correction, I had to pinch and tack weld a total of 4 weep holes on each resonator for my FIL’s 5 Gen. It helped deepen the tone substantially.