Any issues I should expect with a muffler swap?
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Joined: Dec 2020
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Any issues I should expect with a muffler swap?
I have a MagnaFlow muffler (part #: 12249) that I would like to put on... I have been reading how messing with the exhaust can cause issues with sensors and other things. I guess (clearly I'm not very knowledgeable when it comes to exhaust mods).
Are there any problems that would come up if I installed only a new muffler?
Also would this void my warranty with Ford?
thanks for any advice.
Are there any problems that would come up if I installed only a new muffler?
Also would this void my warranty with Ford?
thanks for any advice.
Last edited by ymeski56; Mar 18, 2021 at 02:27 AM.
Senior Member
Joined: Dec 2020
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From: Oceanside,Ca
Schock you will have no issues with O2 sensors by swapping out the muffler. Being that this muffler is a 3” muffler, you will have to get an adapter for the inlet to mate to the stock piping which is smaller. You should have a 3” tailpipe.
My advice would be to take the truck to a muffler shop, have them cut off the piping after the 2 bolt flange, remove it, leave the 3” tail pipe(if equipped, and install a piece of 3” tubing from the 2 bolt flange to your muffler.
My advice would be to take the truck to a muffler shop, have them cut off the piping after the 2 bolt flange, remove it, leave the 3” tail pipe(if equipped, and install a piece of 3” tubing from the 2 bolt flange to your muffler.
Who doesn't want a F150?
Joined: Apr 2015
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From: Kansas
Yes, there will be problems. You will love your truck more and your right foot which will cause it to use more gas 
On a more serious note. Putting the muffler on will not mess up anything but if you are just installing a muffler. The aftermarket muffler may not be the same length so you might have to add some pipe to make it work plus an adapter because stock pipe is not a 3" pipe.
On a more serious note. Putting the muffler on will not mess up anything but if you are just installing a muffler. The aftermarket muffler may not be the same length so you might have to add some pipe to make it work plus an adapter because stock pipe is not a 3" pipe.
Last edited by RaceRed14; Mar 17, 2021 at 12:50 AM.
Joined: Jun 2014
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From: Nowhereville, Barton City Michigan
And, you run the chance of having drone with some aftermarket mufflers. Some MagnaFlows have been known for that. Best bet would be a Borla, Corsa full system, but $$$.
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From: Houston, TX
I wouldn't expect too much drone, if any, with the 12249. Seems to be relatively popular since it's such a cheap swap for relatively good quality.
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From: Pittsburgh, South Hills
FWIW, the Borla Pro XS costs the same as the Magnaflow. It's when you look at a Borla or Corsa cat-back or full exhaust that things get more expensive. If you're looking for better sound, just weld in either a Borla or Magnaflow muffler. It will sound great for short $s.
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I have a MagnaFlow muffler (part #: 12249) that I would like to put on... I have been reading how messing with the exhaust can cause issues with sensors and other things I guess (clearly I'm not very knowledgeable when it comes to exhaust mods). Are there any problems that would come up if I installed only a new muffler? thanks for any advice
If you drive an ecoboost and are okay with nobody liking you -install the muffler and carry on.
