Stock Exhaust

[StrongFord]

Look close. Yes, the whole thing is hanging up there. Just didn't feel like another photo.

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[TheWildman]

Mine is probably somewhere in a scrap yard, slowly rusting away. I had no space for it and why the hell would I keep it anyway. Too quiet.

 

[murphy]

Had the shop throw it away.

 

[TheWildman]

The only thing I kept was the stock downpipe (I went full turbo-back exhaust)

 

[sauerkraut]

If you ever saw the insides of the stock resonator and mufflers I dare say that you would not be keeping the Ford system for very long. There is a Youtube video that shows a cut-a-way of the resonator and mufflers and they are complete garbage by any definition. No wonder they had to do a recall for the 2015's for heat shielding. In the right instance the resonator could catch the car on fire .......... check it out.

Slow down, just because its not straight through doesn't make it inherently bad as exhaust gases don't always work like that.

On the EcoBoost, the stock catback is perfectly adequate. Mishimoto confirmed during their catback R&D that with the stock downpipe still installed, gains from a higher flowing exhaust were negligible at best. Unless you are changing the downpipe, a catback is mostly only for sound.

All in all the stock ford system does what it was designed to, keep the car quiet while flowing as much as it needs to.

 

[Doskiller]

"Slow down" ........... that's a relative term. I researched sources much like you and determined that I needed to make a change concerning exhaust. I changed mine out at 400 miles ........ inspected the resonator and I could not believe what I saw. There was a red spot on top of the resonator about the circumference of a large grapefruit, obviously where the hot air is trapped and swirling before exiting the 2 rear holes. I have no desire to have this furnace under my car ......... but that's me. I did not install a CAI or catback to achieve horsepower gains, not everyone is looking for 11's on this forum. I am trying to make my car better by helping it breathe and hopefully adding longevity.

 

[Evil Minion]

I've got mine sitting in the box the new exhaust came in. Keeping it for now, in case I want to quiet it down in the future for whatever reason.
Switching apartment complexes soon, so who knows if I'll have some crotchety old lady living next door lol.

 

[sauerkraut]

"Slow down" ........... that's a relative term. I researched sources much like you and determined that I needed to make a change concerning exhaust. I changed mine out at 400 miles ........ inspected the resonator and I could not believe what I saw. There was a red spot on top of the resonator about the circumference of a large grapefruit, obviously where the hot air is trapped and swirling before exiting the 2 rear holes. I have no desire to have this furnace under my car ......... but that's me. I did not install a CAI or catback to achieve horsepower gains, not everyone is looking for 11's on this forum. I am trying to make my car better by helping it breathe and hopefully adding longevity.

You're blaming the wrong part for the heat; allow me to explain.

Only 19K EBM's were recalled, manufactured between Feb 2014 - Feb 2015 (and I do not believe it was every single one based on what I recall).

First, the true culprit for the heat shielding recall was not the cat back exhaust system itself, but rather the turbo portion in general. The air after the turbo is hot, which then gets trapped in the downpipe and slowed down as it passes through the catalyst. The stock downpipe then necks down to 2.25" right before connecting to the cat back portion, once again slowing down said hot air. Remember, your exhaust system is only as good as its weakest link. In our case, that is 2.25" from the stock downpipe. This literally means breathing any better is negligible if you put on a 3" straight through cat back to the stock downpipe.

I highly doubt an aftermarket exhaust even helps with the underbody temperatures (which caused the recall you mention). Those pipes are going to heat up just the same as the stock one will, and maybe even more all depending on the construction material used. Truth be told, you can find many threads/posts right here on M6G where owners rear deflectors are melting off. Guess what they all have in common....an aftermarket exhaust. How many rear deflectors are warping from heat on stock exhaust? Not nearly as many or any at all, or else there would be countless threads about those too, but there is not. I can honestly attest to this with my own experience, the rear valance cutout (the bumper itself, not the reflector) for the tips shows signs of melting from my MBRP. Apparently, the tips were getting stupidly hot meaning the rest of the pipe was as well. I smelled burning after hard runs way more often with my aftermarket cat back than I ever did, and now again do with the stock exhaust.

You want to control those temps? Then an upgraded IC and/or higher flow downpipe are the best options, not a cat back. A high flowing cat back will become helpful once you've removed the main restriction caused by the stock downpipe, but not really before.

Regarding your resonator and the red spot; that is just your experience and does not speak for all EBM's. If yours was like that after only 400 miles, then something was obviously wrong. On the flip side, I did not replace my stock exhaust with the MBRP Race until around 4500 miles. My stock exhaust had zero signs of an issue, and I've flogged my car pretty hard ever since driving it off the lot. I'm sure I'm not the only one considering a few others have mentioned they still have their stock exhaust and may not have changed it as soon as you did.

 

[Doskiller]

At 0.32 seconds into the following video, it shows the condition of mine and the last 5 resonators that I have personally seen. If yours does not look like that after "flogging" .......... then I believe you sir are in the minority.

[ame]

If mine was pretty and silver like what you are suggesting ........ I would not change it either, it would be foolish.
As far as the tips go, I have mine mounted a full 1 inch below the valence holes to allow for as much breathing as possible due to heat. What numskull puts the tips all the way in the holes in a perfect circular fashion and does not expect the plastic to melt?
You have your logic and reasoning and I have mine ......... that's what makes this place so great. We can both come here and express our opinions at any time no matter how different ............ see ya on the forum ............ ;-)

 

[TheWildman]

Regarding your resonator and the red spot; that is just your experience and does not speak for all EBM's. If yours was like that after only 400 miles, then something was obviously wrong. On the flip side, I did not replace my stock exhaust with the MBRP Race until around 4500 miles. My stock exhaust had zero signs of an issue, and I've flogged my car pretty hard ever since driving it off the lot. I'm sure I'm not the only one considering a few others have mentioned they still have their stock exhaust and may not have changed it as soon as you did.

I must say that mine was the exact same way, but I had a big blue spot. I'm guessing the metal got pretty hot (~1200*F) to change that color.

Anyway, I'm glad it's gone. The car sounds way better to me. (I can actually hear it and still have a conversation )

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