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Jeep Commander Overland, 4X4, 2 Inch Lift, 1.5 Spacers
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Discussion Starter · #1 ·
I finally got rid of the rear muffler today and replaced it with a 3' inch stainless steel pipe. I thought some may be interested so here's the result with a quick video clip. Sounds more of a HEMI now when giving it some gas and on the move. Not too loud either, it's perfect (for me at least)

Clip: Clip1.mp4

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07 Jeep Commander Overland
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127 Posts
Ive been considering this myself. I am inrerested to hear of MPG changes, mds changes, or anything else you notice once you have ran it a little more.
 

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I did the rear muffler delete a few months ago and there where no codes or affects to anything. Just a slight improvement in the sound, but not by much.
Fuel consumption has not changed
 

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2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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8,736 Posts
I did the rear muffler delete a few months ago and there where no codes or affects to anything. Just a slight improvement in the sound, but not by much.
Fuel consumption has not changed
The muffler provides the engine needed back pressure; Never a good idea to completey do away with it, in my opinion.

That being said, I'm glad you haven't experienced any negative effects.

But, I would not be surprised if you do, somewhere down the road.
 

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Hi BigBlue
To be clear I am not referring to the main muffler removal, just the rear Resonator/2nd muffler..
 

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2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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Hi BigBlue
To be clear I am not referring to the main muffler removal, just the rear Resonator/2nd muffler..
I'm not sure what you're referring to as the "main muffler"......are you referring to the Catalytic Converter?

There is only one muffler that I'm aware of, which is very near the end oif the tail pipe, I'm assuming that's what you removed.
 

· Super Moderator
2006 Commander Limited, 5.7 Hemi QD2
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No there are two mufflers so to speak on Commanders, the back one by the back wheel is technically called a resinator.
See this picture of the underside.
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· Administrator
2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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No there are two mufflers so to speak on Commanders, the back one by the back wheel is technically called a resinator.
See this picture of the underside.
View attachment 45169
Gotcha, now that I'm sitting here thinking about it, that makes sense.

I've seen them both, the light-bulb just never came on.....LOL.
 

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2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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I'm not sure what you're referring to as the "main muffler"......are you referring to the Catalytic Converter?

There is only one muffler that I'm aware of, which is very near the end oif the tail pipe, I'm assuming that's what you removed.
I retract my previous statement @andreve1964 I see what you're talking about now.

That was a complete brain-fart on my part, my apologies.

Thanks @rblapham
 

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2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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· Super Moderator
2006 Commander Limited, 5.7 Hemi QD2
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2008 XK Sport 4.7L V-8 QT-II 4WD 104,xxx Miles
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Yuper - that muffler is about the size of a VW :ROFLMAO:
Yeah the muffler is large;

When you really stop & look at it, the Commander's stock exhaust system, has a pretty odd design compared to other vehicles I've owned.
 
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