Factory muffler design

Makoto · Apr 1, 2017

So our trucks have 3 inch mandrel bent exhaust from the factory. Not too shabby but I'm wondering what the factory muffler is like. Is it chambered or flow through?

I'm thinking of just cutting out the stock on and throwing a dynomax ultraflow 3" in there. anybody have any pics of the stock muffler and resonators on the inside?

Update:

1. the stock muffler is a straight through design
2. the stock resonator is a straight through design
3. the muffler is a 2.5 in 3" out
4. the resonator is 2.5 from the catback flange to the muffler
5. the stock y pipe ends with a 3.25" pipe after the cat going to the flange
6. the stock pip pipe has a 3" flange that is MADE for a 3" exhaust

Here's an breakdown of the connections each forward slash (/) is a connection point and each number is the diameter of pipe on each side

tip(3")/(3")muffler(2.5")/(2.5")resonator(2.5")/(3")cat/Y-split/turbos/engine

This means the stock exhaust has a choke point of 2.5" AFTER the y pipe but the good news is the stock y pipe.

My guess is this was the "good enough" system ford decided to use for all the trucks to be the middle ground for all the engines while keeping NVH to a minimum.

Things we can know for certain:

1. you will never see a performance benefit from a resonator delete
2. a catback will always give benefits even if the software cuts maximum torque output as it is programmed to do.

I know this is common knowledge for many but I had to do some research to get it all and mic the pipes so here it is in one post.

Scott91370 · Apr 1, 2017

Gotta be honest, probably going to sound like... I think you can finish that.

Makoto · Apr 4, 2017

... awesome. have you ever heard an ultraflow? dynomax is great stuff.

mwemaxxowner · Apr 1, 2017

Eventually I'm going to replace the midpipe with 3" from the flange (factory midpipe is 2.5") with a straight through muffler I haven't decided on yet and tie that into the existing 3" tailpipe. I'm considering a magnaflow or one of Flowmaster's straight through mufflers.

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Makoto · Apr 4, 2017

mwemaxxowner said:
Eventually I'm going to replace the midpipe with 3" from the flange (factory midpipe is 2.5") with a straight through muffler I haven't decided on yet and tie that into the existing 3" tailpipe. I'm considering a magnaflow or one of Flowmaster's straight through mufflers.
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do you mean there is a 2.5" restriction at the flange? I thought it was a 3" cat with a 3" flange and 3" all the way back.

RMINC · Apr 3, 2017

This.... down pipes, resonator delete, and factory muffler. I think its near perfect!

mpd.diesel · Apr 5, 2017

Finally found a sound I like. I'm doing this to mine. Thanks for posting.

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mwemaxxowner · Apr 5, 2017

I like this more than any catback I've heard for sure. Just not looking to do downpipes for 80000 more miles lol.

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2Canches · Apr 3, 2017

Solo off road down pipes. 3" straight to some SH¡tty (small) Magnaflow muffler.

Lambo · Apr 4, 2017

Contemplating an aftermarket midpipe with high flow cats and possibly the Magnaflow cat back. It would be nice to hear a little turbo whine, but I may be too old school because a V6 is still a V6, high pitched and raspy, no matter what you do. The stock sounds wimpy, but it's quiet. Love the 2.7, but it's never going to sound like V8.

Mitchf150 · Apr 4, 2017

From a quick Google search, I think the OEM Ecoboost mufflers look like this.

Makoto · Apr 8, 2017

I'm hoping the 2017 raptor fulll exhaust will bolt up to the 2.7 but I'm doubtful since those engines have exhaust manifolds and ours don't.

Makoto · Apr 23, 2017

Updated OP with all information gathered.

mwemaxxowner · Apr 23, 2017

Yep. I'd imagine just changing the midpipe will give as much gain as any catback. I gathered gathered part numbers a while back for a flange/pipe/muffler to make it 3" all the way. I'm not even sure a muffler would make much difference.

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Makoto · Apr 24, 2017

The factory muffler is 2.5 in and 3" out so i don't think that would help. You could reuse the section after the muffler. I wish I knew exactly what kind of 3" flange to get to fab my own exhaust. At the moment I'm thinking AFE or fullrace is the way to go.

13'BoostedPlatinum · Apr 24, 2017

Is the flange at the end of the y pipe a ball flange type? I was just shopping for a flange and 3" pipe so I can weld up my own exhaust.

mwemaxxowner · Apr 24, 2017

It is. The one I showed works.

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Jordan · Apr 25, 2017

Did I read into this to much, changing the exhaust will make the engine limit even more of the torque because you gain more power in the lower rpms? Or am I just on drugs and need to get off the net for awhile.

Makoto · Apr 25, 2017

your PEAK power will only be whatever ford lets it be regardless of how efficient the engine is.

Scott91370 said:
You'll lose some in the low end but gain in the top end. Will you notice the difference? Probably not.

Anytime a turbo can spool faster you'll at least get the same power sooner.

You've got a 325hp/375ftlbtq engine breathing out through a single 2.5" pipe right now, any semblance of low end torque is because the engine is being held back from its potential.
Now, as I understand it, the computer limits PEAK torque of the engine. So without a tune you won't see much peak gain, HOWEVER, I think it does mean you should see more power under whatever peak limit ford has set.

Scott91370 · Apr 25, 2017

You'll lose some in the low end but gain in the top end. Will you notice the difference? Probably not.

Factory muffler design

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