S197 Boss 302 in Chile Build Thread Profile - S197 Mustangs

[Fabman]

Dam Hippie has a meter as well.

He's not the first, and won't be the last.
Best get some mufflers on that thing that have a lot of glass in them.
The glass doesn't hurt performance, but it sure helps deaden the sound.

 

[Fabman]

Having the gas tank out of mine really made the exhaust system easy.
The stock rear mounted space is pretty limited to a turbo style muffler.
I can show you what I used to run that made laguna seca sound and still fit.....it was a tight fit, but they fit.

 

[Mad Hatter]

Yes please!

 

[Coz]

Would a double H-pipe help reduce the sound versus the H + X-pipe?

 

[Mad Hatter]

Would a double H-pipe help reduce the sound versus the H + X-pipe?

Actually think of making and additional second H pipe behind the first.

 

[Mad Hatter]

Having the gas tank out of mine really made the exhaust system easy.
The stock rear mounted space is pretty limited to a turbo style muffler.
I can show you what I used to run that made laguna seca sound and still fit.....it was a tight fit, but they fit.

was that the big pipe that attached to the two flows and dumped out one side? was looking for that in your thread with out success.

 

[Coz]

Actually think of making and additional second H pipe behind the first.

So an H+H+X?

What will it identify as?

 

[Mad Hatter]

Now days you can be what ever you want to be..... But I would prefer that it would be a X, H and H

 

[Fabman]

You guys are having too much fun with this.
I believe once you merge the pipes together with an X or H any additional X's or H's probably don't help.
Yes, they add a small amount of volume to the pipes which is good, but they also create turbulence which is not good, so I don't think there is a net gain there, though I could be wrong about that. Efficient sound absorption and exit proximity is the answer. A big body muffler with lots of glass will be quieter than a long muffler that has a small body and also will be better performing. I'm looking up the exact mufflers I ran before but we're pretty busy today and I don't want to make a mistake so I'll get back here with the information when I can.

 

[Mad Hatter]

I think your probably right for the third cross over, the additional H after the X pipe did bring down the noise level before.. But am not so confident the extra H will do much now. looking into the J pipes as well.. but are those more for drone then actual sound levels?

 

[Fabman]

Almost positive its these:

Dynomax Performance 17793 Dynomax Super Turbo Mufflers | Summit Racing

Free Shipping - Dynomax Super Turbo Mufflers with qualifying orders of $109. Shop Mufflers at Summit Racing.

www.summitracing.com

If this is the correct number it is the ONLY 3" muffler in this style that is 3"" inside. The rest are 2 1/2" inside.
I ran them for a year and they just started to blow the meter at laguna towards the end and I had to use the laguna pipe to get by.

Look in the footnotes of their other similar muffler....have to be careful to get the right number....I'll verify when I can.

 

[Fabman]

I think your probably right for the third cross over, the additional H after the X pipe did bring down the noise level before.. But am not so confident the extra H will do much now. looking into the J pipes as well.. but are those more for drone then actual sound levels?

Adding volume to the exhaust is always a good thing.

 

[Mad Hatter]

I found this link for calculating the "J pipes"

Drone Calculator

Web Site Builder Description

super-null.com

 

[Mad Hatter]

Got a funky idea from my wifes landrover Freelander Diesel.... This is the intake tube. Setup to kill sound.

 

[Mad Hatter]

What about adding two or three 1/4 wavelength resonator pipes to cancel several wavelengths, the problem is what is the typical exhaust gas temp of a coyote engine at full throttle....?

 

[Dave_W]

my Musicians mind kept reading this as D Flat instead of Decibels. LOL.

If you get kicked out for sound, it's a DbM, but if you only get a warning it's a Dbm. If you try to quiet it down after the warning, it's Dbdim. You have to be careful, because if you argue with the officials too much after getting a DbM, you can end up on a Dbsus list.

 

[302BOB]

you can end up on a Dbsus list.

Dave is right, you don't want to end up on that list!!!!!!!!!!!!!!.....that's probably a worry I'll never have to worry about..................................................

 

[Fabman]

If you get kicked out for sound, it's a DbM, but if you only get a warning it's a Dbm. If you try to quiet it down after the warning, it's Dbdim. You have to be careful, because if you argue with the officials too much after getting a DbM, you can end up on a Dbsus list.

Hahahah you nailed it.

 

[Bill Pemberton]

Why not just offer the Sound Engineer at the track some fine Chilean wine! That is a Dbrib, and you might just be under the radar after that?

 

[Mad Hatter]

Why not just offer the Sound Engineer at the track some fine Chilean wine! That is a Dbrib, and you might just be under the radar after that?

We used to do that... but he was easy. He would take a hamburger to get us bye. But once the authorities threatened to close the track down for good, that all went out the window.