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 Post subject: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 17, 2011 9:09 pm 
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Tried searching and couldn't really find my answer. Looking at putting flowmaster 40 series delta flow on the 03 and was wondering for those of you that have replaced there muffler with an aftermarket one did you see any change in mpg +or-.

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 17, 2011 10:06 pm 
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my 03 has the flowmaster 50 suv series delta flow muffler. didn't see much improvement until the aem cold air intake was added with a piece of pipe running to the grille to add even more cold air. I gained at best 1.5 to 2 mpg better.
im not sure about the 40 series, im assuming its pretty much the exact same design just a different sound between 50 and 40 series deltaflow

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 17, 2011 10:26 pm 
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Manly just looking not to lose any mpg with the install. Any interior drone at highway speeds with the suv 50 series? That's the other concern

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Mon Apr 18, 2011 1:18 pm 
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The improvement is not noticeable and the reason why some lose mpg's is due to being a bit heavier on the gas pedal after installing a performance mod.

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 24, 2011 12:08 pm 
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I only noticed a big difference with the exhaust, intake & chip installed all together on the highway cruising got about 19 mpg. Took the chip out after the tranny & transfer case went. Now averaging only 12.5 mpg.

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 24, 2011 10:50 pm 
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2003 4x2 KJ b4 Flowmaster 40 22HWY 15-16CITY
After Flowmaster 40 24.2/3HWY 16-17.5CITY

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Apr 24, 2011 10:56 pm 
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mag03kj wrote:
2003 4x2 KJ b4 Flowmaster 40 22HWY 15-16CITY
After Flowmaster 40 24.2/3HWY 16-17.5CITY

Was that after your first tank of gas? Have you computed milaege recently and how long has it been since the switch?


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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Mon Apr 25, 2011 9:04 am 
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BugginKJ wrote:
mag03kj wrote:
2003 4x2 KJ b4 Flowmaster 40 22HWY 15-16CITY
After Flowmaster 40 24.2/3HWY 16-17.5CITY

Was that after your first tank of gas? Have you computed milaege recently and how long has it been since the switch?


What do u mean after first tank of gas? And the computed part? Its been on since Dec. 2010 so a few months.

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Mon Apr 25, 2011 7:19 pm 
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mag03kj wrote:
BugginKJ wrote:
mag03kj wrote:
2003 4x2 KJ b4 Flowmaster 40 22HWY 15-16CITY
After Flowmaster 40 24.2/3HWY 16-17.5CITY

Was that after your first tank of gas? Have you computed milaege recently and how long has it been since the switch?


What do u mean after first tank of gas? And the computed part? Its been on since Dec. 2010 so a few months.

What I am getting at most people pay attention to the first tank of gas useage which is where a gain in mileage may be found untill the computer learns the change. Unless of course the computer gets reprogrammed by a company like http://www.bgchrysler.com/ to get around the computer learning what is going on and making changes. I was curious if you keep a eye on your mileage and if the added gas mileage is still there even if slight.


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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Wed Apr 27, 2011 11:47 am 
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What do u mean after first tank of gas? And the computed part? Its been on since Dec. 2010 so a few months.[/quote]
What I am getting at most people pay attention to the first tank of gas useage which is where a gain in mileage may be found untill the computer learns the change. Unless of course the computer gets reprogrammed by a company like http://www.bgchrysler.com/ to get around the computer learning what is going on and making changes. I was curious if you keep a eye on your mileage and if the added gas mileage is still there even if slight.[/quote]

Ya from the first tank of the change to the tank on on now its been the same.

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2011 LTZ CrewCab Z71 4x4 Silverado.
Steel Green Metallic.
2" Leveling Kit.
33" Mastercraft A/T-2
Ranch Hand Grille Guard.
Black Low Profile Kobalt Tool Box.
Front & Rear Huskey Liners.


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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Tue May 24, 2011 3:46 pm 
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Lets see...popped on a Borla Cat Back back in 2003, changed intake to a K&N then lifted adn bigger tires, toss on another lift and bigger tires along with chopping up the exhaust and adding a nearly 1,000 pound rear bumper...then an ARB front bumper with winch and the MPG is...oh who cars it is a jeep man! LOL. Let's face it we don't get these because of that. ;) :JEEPIN: :rockon:

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 Post subject: Re: Change in MPG with aftermarket muffler?
PostPosted: Sun Feb 24, 2013 2:44 am 
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If anyone is still interested. My KJ is modified with a K and N cool box and a Magnaflow cat back. If I do not step on it aggressively the mileage is about 1 mile more but my
horsepower is definitely up a noticeable bit as is the torque. It has a not too loud deeper sound which I love. :JEEPIN:

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