Flowmaster Extension location - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 11 (permalink) Old 02-06-2011, 05:35 PM Thread Starter
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Flowmaster Extension location

Hi Everyone,
Very new on this forum, very informative and loving it.
I noticed from the previous thread, the pipe extension for the flowmaster was installed before the muffler, therefore, the muffler is now farther from the engine. Any advantages/disadvantages, or does it make any difference?
I do understand, with this set up, you only need to cut one pipe instead of 2 for front and back.

Thanks in advance for your input!

CT
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post #2 of 11 (permalink) Old 02-27-2011, 09:11 AM
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I dont think there is any difference in performance gains. I could be wrong, but where the muffler is mounted is more for sound than performance.
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post #3 of 11 (permalink) Old 04-12-2011, 03:35 PM
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Just did the Flowmaster 50 Series SUV muffler. The extension is toward the front. I think i would prefer it that way, if the muffler was to the front you might here it under your feet more. BTW, I love the sound, Really no drone at all other than the tranny shifting early and the Jeep lugging around. I picked up almost 2 mpg on average, but thats before putting my foot into it, also notice that if i use in 5th around town under 50 it helped get to that mpg increase..

2007 Jeep Commander Limited 5.7L HEMI, Flowmaster SUV 50 series muffler, Drilled and Slotted Rotors, RC 2" Lift, Firestone Destination AT 245-75-17, 1.5 " spacers.

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post #4 of 11 (permalink) Old 04-12-2011, 03:41 PM
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Quote:
Originally Posted by Twisted289 View Post
Just did the Flowmaster 50 Series SUV muffler. The extension is toward the front. I think i would prefer it that way, if the muffler was to the front you might here it under your feet more. BTW, I love the sound, Really no drone at all other than the tranny shifting early and the Jeep lugging around. I picked up almost 2 mpg on average, but thats before putting my foot into it, also notice that if i use in 5th around town under 50 it helped get to that mpg increase..
Mind if I ask how you picked up 2 mpg by changing a muffler?
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post #5 of 11 (permalink) Old 04-12-2011, 04:18 PM
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I have no Idea, I averaged 12.7 before, I know avererage 14.4, I dont think it was strictly the muffler, I think because of the muffler I can hear the engine lugging and i shift into 5th. Honestly expected maybe 1mpg with the free flowing exhaust, anything above is bonus... BTW the new muffler is about 1/3rd the size of the original..

2007 Jeep Commander Limited 5.7L HEMI, Flowmaster SUV 50 series muffler, Drilled and Slotted Rotors, RC 2" Lift, Firestone Destination AT 245-75-17, 1.5 " spacers.

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post #6 of 11 (permalink) Old 04-12-2011, 06:21 PM
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Did you leave the rest of the system alone ie: resonator/tail pipe?

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post #7 of 11 (permalink) Old 04-12-2011, 06:35 PM
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Originally Posted by HamiltonLJ View Post
Did you leave the rest of the system alone ie: resonator/tail pipe?
I know your not asking me, but as for my .02 worth...my resonator delete with a Gibson 12" stainless tip gained me zero on gas mileage...but it does give me a nicer exhaust note especially above 3K rpm. Someday I'm gonna put a 50 series Flowmaster on mine, but for now I'm still enjoying the quiet interior and don't wanna do anything soon to make it louder.
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post #8 of 11 (permalink) Old 04-13-2011, 12:34 PM
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Originally Posted by HamiltonLJ View Post
Did you leave the rest of the system alone ie: resonator/tail pipe?

Yes, I left everything else as original, As for the sound, its not too loud at all until I put my foot down...

2007 Jeep Commander Limited 5.7L HEMI, Flowmaster SUV 50 series muffler, Drilled and Slotted Rotors, RC 2" Lift, Firestone Destination AT 245-75-17, 1.5 " spacers.

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post #9 of 11 (permalink) Old 04-13-2011, 07:51 PM
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Thanks Guys

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post #10 of 11 (permalink) Old 04-17-2011, 02:37 AM Thread Starter
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Quote:
Originally Posted by HamiltonLJ View Post
Thanks Guys

X2! i went ahead and had mine installed thesame way with the extension infront of muffler but i think i'm gonna need a resonator, it's a little bit too loud when idling. i only want the growl when accellerating.

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