Looking for quiet, performance muffler?
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Senior Member
Joined: Mar 2014
Posts: 539
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From: Cincinnati, Ohio
Year: 1999
Model: Cherokee
Engine: 4.0
Looking for quiet, performance muffler?
Right now I have a Thrush Welded muffler with Performance curve Cat, APN header, 2 1/2 all the way back. I have had this set up for a round three months, since I replaced my old 4.0 with a rebuild. I liked the sound of it at first but when I replaced the engine I had a bad AC compressor so I put in a delete pulley instead. Well now that I have to have the windows open a lot since it warmed up the droning is driving me crazy. from about 1400-2000 rpms I can barely hear the radio which is most of the time in city driving.
I am looking for something that will come in 2 1/2 with some performance benefits to it but not be so obnoxious, any suggestions?
I am looking for something that will come in 2 1/2 with some performance benefits to it but not be so obnoxious, any suggestions?
Senior Member
Joined: Mar 2012
Posts: 974
Likes: 14
From: Racine, WI
Year: 1997
Model: Cherokee
Engine: 4.0
Dynomax's cat-back is fantastic and $100 after rebate until July. $150 normally. It's 2.25", but that's fine. 2.25" is ideal for a 4.0. With 2.5" you sacrifice power in the RPM range you need it for theoretical gains up high where you never rev. Having 2.5" system step-down to 2.25" at the cat, muffler, or tailpipe is totally fine if not just right since the exhaust starts-out hot and gets denser as it cools.
Last edited by mschi772; May 30, 2015 at 04:59 PM.
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Joined: Feb 2014
Posts: 2,379
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From: Florida
Year: 2000
Model: Cherokee(XJ)
Engine: Golen 4.6L
I have a Gibson 617201 stainless exhaust on mine. It's 2.5". I wouldn't call it "quiet" exactly, but it isn't exactly loud either. You can tell when you hear it that it isn't stock, but it doesn't wake the neighbors. It has a nice deep tone with no drone that I've noticed.
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Joined: May 2015
Posts: 1
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Model: Cherokee
Dynomax's cat-back is fantastic and $100 until June (one day away). $150 normally. It's 2.25", but that's fine. 2.25" is ideal for a 4.0. With 2.5" you sacrifice power in the RPM range you need it for theoretical gains up high where you never rev. Having 2.5" system step-down to 2.25" at the cat, muffler, or tailpipe is totally fine if not just right since the exhaust starts-out hot and gets denser as it cools.
Senior Member
Joined: Mar 2012
Posts: 974
Likes: 14
From: Racine, WI
Year: 1997
Model: Cherokee
Engine: 4.0
There's a $50 rebate, and it sells at numerous places for $150; Summit is the technically lowest I've seen, but everyone hovers within a few cents/dollars of each other. 150-50=100
CORRECTION: the rebate is through June 30th. http://www.dynomax.com/promotions/
CORRECTION: the rebate is through June 30th. http://www.dynomax.com/promotions/
Last edited by mschi772; May 30, 2015 at 04:59 PM.
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