Dynomax ultraflo problem need help

benno440 · May 30, 2015

Hey guys, so some of you may know I just got my charger dyno tuned and on my way home I developed a rattling noise at around 1500-3000 rpm.
got home and got under car while someone revved the engine and there is a deadful rattling noise coming from my driver side dynomax ultra flo muffler.
now before I go cutting up my exhaust and muffler to try and repair it, maybe someone might have an idea on a easier way to fix it.
or it could be something else, maybe my muffler bearing has shat itself

mopar 3 B · May 30, 2015

Replace the muffler bearing it has broken loose from the case.

kiwigtx · May 31, 2015

Did you pre-load the muffler bearing with the correct amount and grade of grease? :thumbsup:

The only thing I can think of is that a baffle plate has come loose inside the muffler??

Dennis H · May 31, 2015

Sorry to hear this. A pisser. I'd be tempted to beat the sob with a rubber mallet.

benno440 · May 31, 2015

the muffler bearing part was a joke, I really do have a rattle lol.
possibly the inner mesh has let go, what a pain in the *** this is going to be to fix.
any ideas on best way to do it, I was thinking cut the end off and maybe a piece out of the side then re weld it all back in

kiwigtx · May 31, 2015

benno440 said:
the muffler bearing part was a joke, ....

I know....tongue was wedged firmly in the cheek when writing that comment :icon_mrgreen:

corunna bird · May 31, 2015

squeeze it with a C-clamp to see if it goes away?

HYRDGOON · May 31, 2015

Dammit Benno I just noticed a rattle too around the same RPM range and was wondering where it could be coming from. And I run the same Mufflers!

440+6 · May 31, 2015

I see a pattern emerging.

conv67bdere · May 31, 2015

benno440 said:
or it could be something else, maybe my muffler bearing has shat itself

You crack up Benno . . . that was good . . . LMAO

Trouble is, now I've got to clean my drink off my computer monitor . . . ( sigh ) . . . LMAO . . .

Thanks for the chuckle . . . good luck to you on getting it corrected ( and quickly ) . . .

747mopar · May 31, 2015

If it were me I'd take it apart, take a picture and send it to them. Those aren't by any means a cheap muffler so they should stand behind them.

benno440 · Jun 1, 2015

gents for those interested I found the problem, I dropped the muffler off and found where the 'dynomax pressed writing in the top of the muffler had a massive crack through it which was letting exhaust gas out and rattling together when pressure went through. I cut muffler open to make sure and yep all internals were fine, just a massive crack in the top, while I was fixing that I noticed on one of the ends where one of the dodgy dynomax welds were it had not penetrated properly and exhaust gas was coming out of there as well, so I fixed this. and wow my car no sounds better than it ever did. must of been cracked for a while.

747mopar · Jun 1, 2015

Good to hear.

65-440 · Jun 3, 2015

interesting, I've been running ultra flos for 3 yrs now with zero issues ......

Dynomax ultraflo problem need help

benno440

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mopar 3 B

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kiwigtx

Henchman #4 and Jack-Stand Racer #2

Dennis H

FBBO Gold Member

benno440

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kiwigtx

Henchman #4 and Jack-Stand Racer #2

corunna bird

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HYRDGOON

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440+6

FBBO Gold Member

conv67bdere

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747mopar

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benno440

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747mopar

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65-440

Well-Known Member

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