S197 Boss 302 in Chile Build Thread Profile - S197 Mustangs

[Fabman]

I see you have 4 mufflers on the car....replacing the rear ones with these might just get you there:

Pardon Our Interruption

That's what I use and I have the quietest car on track.
That white mustang behind me meets the 90 db at laguna and he's about as loud as me with stock mufflers.

https://www.facebook.com/video.php?v=626121165224819

 

[Mad Hatter]

I see you have 4 mufflers on the car....replacing the rear ones with these might just get you there:

Pardon Our Interruption

That's what I use and I have the quietest car on track.
That white mustang behind me meets the 90 db at laguna and he's about as loud as me with stock mufflers.

https://www.facebook.com/video.php?v=626121165224819

Boy!! thats quite!!!

 

[Mad Hatter]

You just have those Borlas and a Xpipe?? I have a mini Dynamax before the Xpipe. a longer Dynaflow race glass pack between the Xpipe and the H pipe, then another mini before the Dynamax ultraflow muffler.... then a 90 Degree turndown... whole lot of extra weight!!!

 

[Fabman]

 

[Mad Hatter]

Ahh, thats very cool, I forgot about your setup... I think the KISS theory just kicked me!

 

[Fabman]

All else being equal, a muffler with a larger case will always be quieter than a muffler with a smaller case in the same length. So lots of thin mufflers probably won’t equal one big case muffler and one big case muffler will almost certainly out perform it.

 

[Fabman]

Ahh, thats very cool, I forgot about your setup... I think the KISS theory just kicked me!

It’s a place to start, then if that’s still not enough you can add a resonator upstream. Just my 2 cents.

 

[Fabman]

Also, the more distance between the motor and the muffler, the better.

 

[Mad Hatter]

Thanks for the tips. Will get the readings tomorrow and see if we start hacking and welding right away or not.

 

[Scootsmcgreggor]

I’ll throw another similar option out there. I used two Borla ProXS mufflers which are generally regarded as quieter than xr1’s. Mine is plenty quiet, though not had it to Laguna yet for the real test. They’re cheap too, worth a look at. Also there are a couple resonated h pipe mid mufflers that you might want to look at as well. The large case volume should bring down the sound more than the various bottle style resonators you currently have.

 

[Fabman]

I’ll throw another similar option out there. I used two Borla ProXS mufflers which are generally regarded as quieter than xr1’s. Mine is plenty quiet, though not had it to Laguna yet for the real test. They’re cheap too, worth a look at. Also there are a couple resonated h pipe mid mufflers that you might want to look at as well. The large case volume should bring down the sound more than the various bottle style resonators you currently have.

Some viable options here.:

Borla ProXS Universal Mufflers Search Results

Made of rust-free high quality, austenitic stainless steel, Borla ProXS mufflers deliver more power, improved fuel economy, prolonged engine life, and a street-commanding growl that screams performance.

www.borla.com

What I would like to see is the actual ID of the cores.
Most of the 3" oval style mufflers I have seen have 3" connectors, but the core inside is smaller to further attenuate sound. 2.5" mufflers typically do not neck down. Looking at these pictures it appears that the do indeed neck down just as they enter the muffler body....but I don't know for sure without having one in my hand.

 

[Fabman]

That little bulge where it enters the body is a swage, and the inlet is pressed into it, so the actual core is smaller than that. This is probably a 2 1/2" core...possible 2 3/4" but doubtful that its 3".

 

[Fabman]

Here's the same muffler in 2 1/2"....notice its not all swaged up at the end?

 

[Mad Hatter]

Yes, I guess reducing to 2.5" would be a fool proof way of reducing sound (flow)

 

[Fabman]

Yes, I guess reducing to 2.5" would be a fool proof way of reducing sound (flow)

Its a very common technique.

 

[Scootsmcgreggor]

Stainless Bros do not neck down, all their stuff is true ID for whatever tubing size the muffler/resonator is.

 

[Bill Pemberton]

You need to just tell those Chileans that 103dbas kills Covid germs!!!!

 

[Fabman]

You need to just tell those Chileans that 103dbas kills Covid germs!!!!

You see Pedro, the Coyote emits a very specific frequency at 8000 rpm and 104 db that disrupts reproduction of the Covid virus....so you need to pay us to come to the track and save those people in the bleachers.

...it will be standing room only. LOL.

 

[Fabman]

 

[Bill Pemberton]

Now that is appropriate Fab, quoting another Nebraskan who understands mufflers are only a fashion statement for wimpy
folks who have to wrap their necks when the weather is chilly --- or is that Chile!?

What, you didn't know is ole Larry just lives down the road from me , you should not be surprised as I have been accused of being a bit........................ corny !