What's inside 2018 GT mufflers?

[jmeiers]

Wow, after looking at the photo, that cannot be good for power versus a straight thru muffler. That's probably why the stock non-active mufflers sound tinny.

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[Mikepol2]

Wow, after looking at the photo, that cannot be good for power versus a straight thru muffler. That's probably why the stock non-active mufflers sound tinny.

Agreed, that tinny sound is the thing making me look for a replacement, for the longest time I thought something must be loose under the car...

 

[slink]

I’m just switching up my stock non active axle back to a super 44 two chamber to change the tone. Not looking for much if any more volume overall.The stock mufflers are a little too tinny sounding to me, but I do not want the bullet style (Roush, magnaflow, corsa). Had the offroad X with straight through bullets on my 14. Tired of the blatty x pipe sound under throttle myself. Friend has s550 with h resonator

Do you have a sound clip of this setup?

 

[Andy13186]

[QUOTE="BOBS550, post: 2603368, member: 17192"I found this pic of a 18 Mustang GT muffler cut open, looks like room for flow improvement but the sound on ours was good. I went with MBRP Street and happy! [/QUOTE]

Holy shite that is a disgrace of a design... Ford should have made the active mufflers standard. Glad I have cutouts infront of my non active mufflers. Seriously what the hell is this design? I am mad.

 

[Zinc03svt]

Do you have a sound clip of this setup?

I will on Wednesday.

 

[BmacIL]

[QUOTE="BOBS550, post: 2603368, member: 17192"I found this pic of a 18 Mustang GT muffler cut open, looks like room for flow improvement but the sound on ours was good. I went with MBRP Street and happy!

Holy shite that is a disgrace of a design... Ford should have made the active mufflers standard. Glad I have cutouts infront of my non active mufflers. Seriously what the hell is this design? I am mad.[/QUOTE]
You think that's bad? 15-17 muffler.

 

[TX-Ripper]

Do you have a sound clip of this setup?

Cjpp magnaflow true x would fix that.

 

[re-rx7]

Lol @ the people who think this is hurting flow.....The design is really good.

 

[BmacIL]

I haven't run the CFD or tested it, but the differences shown here are larger than just run to run or day to day variation. The primary source of restriction change is the muffler, as the resonator is completely straight through.
https://www.mustang6g.com/forums/th...type-catback-on-2018-gt-massive-gains.123363/

 

[re-rx7]

I haven't run the CFD or tested it, but the differences shown here are larger than just run to run or day to day variation. The primary source of restriction change is the muffler, as the resonator is completely straight through.
https://www.mustang6g.com/forums/th...type-catback-on-2018-gt-massive-gains.123363/

Dyno's say the resonator is the restriction?

 

[Andy13186]

Dyno's say the resonator is the restriction?

No they dont, the resonators are straight through like others said, these muffler designs are clearly horrible. How could you consider that a good free flowing design?

 

[re-rx7]

No they dont, the resonators are straight through like others said, these muffler designs are clearly horrible. How could you consider that a good free flowing design?

Ummm yes they do. People often confuse looks and and flow. There is another thread on here where multiple people changed the resonator and gained 10rwhp. then mufflers and no change.... everyone gets caught up in this straight through shit. The last gen 15-17 gave zero power with the mufflers and it "looked" alot worse than these.

 

[re-rx7]

Link to thread.
https://www.mustang6g.com/forums/threads/gen-3-coyote-engine-dyno-numbers.124321/#post-2584447

 

[mustang1]

I haven't run the CFD or tested it, but the differences shown here are larger than just run to run or day to day variation. The primary source of restriction change is the muffler, as the resonator is completely straight through.
https://www.mustang6g.com/forums/th...type-catback-on-2018-gt-massive-gains.123363/

appears that straight through design is only marginally better than OEM, despite what it looks like inside the mufflers :

https://motoiq.com/tested-ford-performance-cat-back-exhaust-and-gt350-valence/10/

"The new exhaust put down an average of 377whp at 6,450rpm and 345lb-ft of torque at 4,000rpm on a slightly hotter 89*F day with similar humidity. This gives us a peak to peak gain of 7.09whp and 3.02lb-ft of torque and a maximum gain of 13.62whp and 13.26lb-ft of torque at 5,400rpm

 

[3star2nr]

Wow, after looking at the photo, that cannot be good for power versus a straight thru muffler. That's probably why the stock non-active mufflers sound tinny.

The goal isnt power its to control noise so that they can get the certs to sell the cars...

Noise is just energy, so the factory exhausts do a great job at slowing the exhaust down and losing some of the energy...

As the velocity decreases the exhaust pitch gets lower and more "bassy" which is what you want right? Imho its a simple and pretty effective design.

Nice thick walls too and good stainless steel, it's designed to last.

Its designed like A transmission line speaker... Ford knows what they're doing man...

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