Glass pack on the 4.7? - Jeep Commander Forums: Jeep Commander Forum
Exhaust Questions or advice about exhaust systems? This is the place...

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post #1 of 15 (permalink) Old 12-20-2014, 12:30 PM Thread Starter
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Question Glass pack on the 4.7?

I ordered a glasspack from summit cause my stock muffler had a hole punched in it. Has anyone done this? does it sound good? let me know please.
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post #2 of 15 (permalink) Old 12-20-2014, 03:06 PM
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Quote:
Originally Posted by 4.7 06 LIMITED View Post
I ordered a glasspack from summit cause my stock muffler had a hole punched in it. Has anyone done this? does it sound good? let me know please.
If you have already ordered it, it's kinda' late to be asking don't you think ? I would think a glasspack will be rather loud.

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post #3 of 15 (permalink) Old 12-20-2014, 03:14 PM
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I've not heard it or seen it in searches.

I do think it would be quite loud. Depends on preference, though. I think it would be louder than I prefer.

I have a Flowmaster Super 50. Nice "presence" of volume, but not too loud for my tastes.

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post #4 of 15 (permalink) Old 12-20-2014, 04:36 PM
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A glass pack is usually just a straight perforated pipe with fiberglass wrapped around it, it allows some expansion and noise absorption, but its almost more of a resonator than a muffler, it barely does anything to reduce the noise level.

The Catalytic Converters do a lot to muffle the sound of the exhaust, but still a glass pack is going to be loud, NOT as loud as 60's/70's muscle cars that had straight pipes all the way through. But perhaps loud enough to annoy neighbors and get you ticket from cops in some areas.


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post #5 of 15 (permalink) Old 12-21-2014, 05:47 PM Thread Starter
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thanks for all the input. Got it yesterday and installed it today. sounds pretty good. somewhat noticeable sound inside. will post video soon. I fired it up dumping at the cats and it had a pretty rough sound. put the glasspack on and it cleaned it up alot but with the same sound
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post #6 of 15 (permalink) Old 12-21-2014, 06:13 PM
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Glass pack on the 4.7?

Glad you like it! Look forward to the video. The Commander needs a bit more presence of sound so it doesn't come across as another "grocery getter".

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post #7 of 15 (permalink) Old 12-22-2014, 08:02 AM
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Quote:
Originally Posted by 4.7 06 LIMITED View Post
....I fired it up dumping at the cats and it had a pretty rough sound. put the glasspack on and it cleaned it up alot but with the same sound
So are you saying, the volume/level of the sound is about the same as open pipes after the Cat's, but with the Glass Packs its changed the tone of the exhaust?

Goes along with my speculation, but things like exhaust and mufflers vary greatly amongst different engines and cars.


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post #8 of 15 (permalink) Old 12-23-2014, 09:40 AM Thread Starter
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Video should be up today. Taking it on a 2 hr highway trip today. gonna get footage of outside revs inside revs and some cruising sound. was driving last night cruising at 40 and it wasnt noticeable inside. could easily hear everyone and the radio.... Should be interesting.
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post #9 of 15 (permalink) Old 12-23-2014, 03:55 PM
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Got rid of the oe muffler and installed a F150 resonator in its place, better mpg's and the sound doesn't bother me much.

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post #10 of 15 (permalink) Old 09-15-2015, 07:54 PM Thread Starter
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well after 9 months its not to bad. shes been on a few 10+ hr road trips and we could all have a conversation and we didnt have to shout...
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