Exhaust

[tugboat95]

What are you guys running? I'm coming from a V8 small block background with the deep throaty exhausts. So what do you put on these inline 6 engines? I don't want to wake the neighbors but I do want it to sound like a truck not a soccer mom mobile.

 

89 Comanche

Eliminator

2wd

4.0L

5 speed PukeGoat

Factory Original

 

 

 

[Big Dan]

I'm not big on the exhaust sound. I've got an HO exhaust manifold mated to an OE style Walker exhaust.

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[Pete M]

a giant Borla muffler.  like, for a big truck.  very quiet at idle and throaty when I'm on the skinny pedal. 

 

It's not a v8 though. 

[Chad R]

6 minutes ago, Pete M said:

a giant Borla muffler.  like, for a big truck.  very quiet at idle and throaty when I'm on the skinny pedal. 

 

It's not a v8 though. 

I loved the sound of the borla on my tj with a 4.0 till the welds broke internally( rocks might have had something to do with that). I’m running a muffler now from gale banks it’s sounds good and does not sound like a fart can.

[JustEmptyEveryPocket]

Best sound I ever had from my truck was when the pipe broke at the front muffler weld. So it was basically a straight, short pipe. Amazing rumble, although it had a slight drone. I still loved it. The wife ... "encouraged"... me to put a muffler back on. I might have left it otherwise.

[ComancheKid45]

I'm a big fan of the Thrush Welded mufflers. Depending on your area, replacing the Catalytic Convertor with an 18" glasspack compliments the muffler great! A distinctive sound and just enough volume.

[ghetdjc320]

I run a magnaflow stainless spun cat and magnaflow muffler and am happy with the sound. Not very harsh at all. Also ran a Gibson mwr muffler and liked it also, more so than the magnaflow. To me a straight 6 sounds best on about a 20” glass pack with 2.25 or 2.5 tubing. The flow masters, magnaflows, Gibson’s and the like sound better on that off-beat non balanced V8 sound but a straight 6 has a totally different sound. Very balanced and smooth. I like to pursue the sound of performance straight 6’s instead like European cars. It doesn’t sound “ricer” by any means but a glass pack really adds some depth and brings out that straight 6 sound. Headers, downpipe and even tips all contribute to the sound also.

[Eagle]

It's an in-line six -- there is no way to get it to sound as sexy as a V8. The only exhaust I've ever heard that sounded at all decent on a Jeep I6 was a Gibson.

 

https://gibsonperformance.com/p-27232-jeep-exhaust-systems.html

 

[ghetdjc320]

This video let’s you hear the sound of about every mainstream I6. V8s have an offbeat unbalanced sound which also has its charms. However straight 6s have a unique balanced sound I have come to appreciate. A tuned I6 is a sweet engine. 

 

[Eagle]

The "thing" (I won't call it a "problem," because except for the sound it's a feature, not a bug) is that with an I6 the exhaust pulses are perfectly evenly spaced, so the sound comes as more of a steady sound rather than individual pulses. The Jeep 4.0L is especially this way because it's an old-school engine at heart (the basic engine goes back to 1964, in a Rambler). It's a comparatively low-compression engine with a mild, street cam. You can make it sound "pulsier" (to coin a phrase) by switching to a cam with higher left and shorter duration, so the pulses are stronger and have a bit more separation. If you run headers, a true dual exhaust might help, also.

 

[JMO413]

I am very happy with my Thrush fully welded.