Removed Stock Muffler

Jamesmcga

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So I removed my stock muffler on my JK and it had a very high pitched “ricer” sound (know that’s not P.C., but whatever). Ended up putting on a Gibson muffler...fast forward to my JL.

JL w/ the muffler removed sounds way different...way better than the JK. I’m not sure if it’s the compression change or way the exhaust is routed...

Any else done this?
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Rockmaninoff

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So I removed my stock muffler on my JK and it had a very high pitched “ricer” sound (know that’s not P.C., but whatever). Ended up putting on a Gibson muffler...fast forward to my JL.

JL w/ the muffler removed sounds way different...way better than the JK. I’m not sure if it’s the compression change or way the exhaust is routed...

Any else done this?
Interesting. Thanks for the report.

Maybe resonator design? That has a huge impact on overall sound. The stock muffler just affects the volume.
 
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Jamesmcga

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Interesting. Thanks for the report.

Maybe resonator design? That has a huge impact on overall sound. The stock muffler just affects the volume.
Exactly. The JL sounds like the JK w/ magnaflow rock crawler exhaust.
 

Rockmaninoff

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Swanny297

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So I removed my stock muffler on my JK and it had a very high pitched “ricer” sound (know that’s not P.C., but whatever). Ended up putting on a Gibson muffler...fast forward to my JL.

JL w/ the muffler removed sounds way different...way better than the JK. I’m not sure if it’s the compression change or way the exhaust is routed...

Any else done this?
Other than sound does removing the muffler cause any mechanical / performance / sensor issues?
 

Rockmaninoff

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Other than sound does removing the muffler cause any mechanical / performance / sensor issues?
There are no sensors in the muffler. Muffler removal doesn't make things worse but the resonator removal gives a loss of low end torque usually.
 
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Jamesmcga

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So I went on a 250 mile trip yesterday and their was little torque above 65 mph. I averaged 12.9 mpg on the highway. Removing the muffler zapped my highway mpg’s. Around town i avg. 14 mpg which is expected w/4.10 gears and 37’s.

I need to add some backpressue; thinking about adding simple glasspack muffler.
 
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Jamesmcga

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Ive seen that video...good stuff!

I did not have a front bumper on, it was just a steel frame... that could have caused extra wind resistance.

However, the removal did affect the exhaust velocity and power was down. Before exhaust removal I could be in 6th going 70 mph; w/o I had to be in 5th.
 
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