New dynomax muffler rattling - JeepForum.com

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post #1 of 19 Old 04-17-2013, 10:56 AM Thread Starter
jfallon1
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New dynomax muffler rattling

I just installed the muffler mentioned on a stock 2dr 2011 jk and noticed when I installed that the muffler sat at an angle and was rubbing against the heat shield above the muffler and now has a rattle. Has anyone else had this problem and if so, what did you do to fix it? Thanks

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post #2 of 19 Old 04-17-2013, 11:28 AM
Dynomax_Exhaust
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What muffler/exhaust system, by chance?
Can you adjust it?
Pics, if possible?
Thanks!
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post #3 of 19 Old 04-17-2013, 12:36 PM Thread Starter
jfallon1
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No adjustment because everything came prewelded. It's single inlet dual outlet cat back exhaust. Part number from 4wheelparts is DYN39510. The only picture I have is before installed just to give an idea of what it looks like. I won't be able to take A picture of it installed till the weekend. Everything installed perfectly its just the way the muffler itself is its an angle and hits the heatshield.
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post #4 of 19 Old 04-17-2013, 01:02 PM
janders82
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Quote:
Originally Posted by jfallon1
No adjustment because everything came prewelded. It's single inlet dual outlet cat back exhaust. Part number from 4wheelparts is DYN39510. The only picture I have is before installed just to give an idea of what it looks like. I won't be able to take A picture of it installed till the weekend. Everything installed perfectly its just the way the muffler itself is its an angle and hits the heatshield.
Side note...how do you like the sound?

2010 JKU Automatic w/ 5.13 Gears
2.5" TeraFlex w/ Rancho XL9000s
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post #5 of 19 Old 04-17-2013, 01:24 PM Thread Starter
jfallon1
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Love it. It's got a throaty sound. Not just at idle and low gears, through all gears up till about 4th it still has a groan to it. It's also paired with an airaid CAI so that helps too. It seems like its a whole new jeep with some actual low end power that it was missing before.
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post #6 of 19 Old 04-17-2013, 01:37 PM
RockyClymer
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Ohhh boy, seat of the pants dyno agn....won't it just die?

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post #7 of 19 Old 04-17-2013, 02:19 PM
SubAtomicGenius
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Yeah, I don't know why Chrysler just won't change the muffler/air system to increase performance and HP gains. Or maybe just play a synthesized V8 sound when you put your foot on the accelerator? That would be sweet.
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post #8 of 19 Old 04-17-2013, 02:52 PM
Dynomax_Exhaust
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Our Super Turbo AXLE back mounted on a 2012....




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post #9 of 19 Old 04-17-2013, 02:56 PM
SubAtomicGenius
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^^^ Sure beats the overweight stock POS muffler, that's for sure. Looks nice and shiny! Now get some mud and rock-dents/scrapes all over it to really impress us.
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post #10 of 19 Old 04-17-2013, 03:08 PM
Dynomax_Exhaust
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Quote:
Originally Posted by SubAtomicGenius View Post
^^^ Sure beats the overweight stock POS muffler, that's for sure. Looks nice and shiny! Now get some mud and rock-dents/scrapes all over it to really impress us.
Ha! It is a lot smaller than stock for sure. I THINK we removed this and then installed yet another system we have.... yep the other system on it now removes the resonator you can see in those pics.
I am a BIG fan of relocating the muffler to UNDER/ IN FRONT of the rear axle on driver side.

We have a couple of those systems too.


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post #11 of 19 Old 04-17-2013, 03:46 PM
222Doc
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I would rather put a Gen right tank there and then a real duel set up. then you can get rid of the fuel tank that hangs down like a beached whale, flat belly it. Then you can add a real 4 link that is tucked.

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post #12 of 19 Old 04-17-2013, 03:52 PM
Dynomax_Exhaust
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Quote:
Originally Posted by 222Doc View Post
I would rather put a Gen right tank there and then a real duel set up. then you can get rid of the fuel tank that hangs down like a beached whale, flat belly it. Then you can add a real 4 link that is tucked.
Like! But without crawling under my JK (about a foot of snow on the ground), duals might be tough with that tank. But not too sure!
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post #13 of 19 Old 04-18-2013, 02:25 PM
janders82
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Quote:
Originally Posted by jfallon1 View Post
Love it. It's got a throaty sound. Not just at idle and low gears, through all gears up till about 4th it still has a groan to it. It's also paired with an airaid CAI so that helps too. It seems like its a whole new jeep with some actual low end power that it was missing before.
you get any drone at highway speeds?

2010 JKU Automatic w/ 5.13 Gears
2.5" TeraFlex w/ Rancho XL9000s
17" XD Addicts
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post #14 of 19 Old 04-20-2013, 12:06 PM Thread Starter
jfallon1
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Quote:
Originally Posted by janders82 View Post
you get any drone at highway speeds?
There is a little but that's only heard with the radio off and trying to hear it.
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post #15 of 19 Old 04-22-2013, 09:10 AM
jwmbishop
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Quote:
Originally Posted by jfallon1 View Post
There is a little but that's only heard with the radio off and trying to hear it.
Shoulda used the VVT. Haven't heard em on a JK but I went that route on a 383 dual and love em. Of course on a dual set you have to equalize the two pipes before the muffler (cross or h pipe) but man do those things sound sweet! Nice "quiet" idle and cruise - but when on the skinny it is well toned and high flow - with enough rumble to know you are moving air!

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The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a hard knock...
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