A hole on muffler

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novemberr

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Hello forum,

The car is 2012 Denali with 80k miles.
Today, when I flushed the brake fluid, I found that the water was dripping from that small hole on the muffler.

Can you please suggest a replacement?
Should I replace only the muffler?
How about the pipe before and after the muffler?
Are they one unit or separate parts?

I appreciate your help.

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Rocket Man

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Yeah you need a new muffler. It needs to be cut out and welded in, and if the pipe coming in or out is rusted it needs to be cut out and replaced. I would go to a couple different muffler shops and get a quote unless you can weld. The muffler you install is a matter of personal preference if you want something a bit louder or throatier or if you want it the same sound as it has now. Any idea what you want as far as sound?
 

PG01

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Unless it’s rusted through and loud you don’t need a new muffler. If the truck sounds the same as it always had you are fine. The hole is there from new to let condensation drip out so it doesn’t collect inside and completely rot from inside out.
 

drakon543

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^^x2
most oem mufflers if not all have a condensation drip hole.
if your just trying to convince the wife you need a new exhaust then it's shot probably should replace it from the cat back. the muffler unicorns escaped and are poking holes in the muffler bearings.
 
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I posted this same question a year or two ago when I first saw that same hole on my muffler on my 2012. Was told it's normal and supposed to be there

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iamdub

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Yup- it's a drain hole. They just start to rot around it so then it looks like you have a spot that rusted through. Rust didn't cause the hole, the hole caused the rust. At this point, it's perfectly fine and functioning as intended. Ignore it unless you wanna use it as an excuse to get a new and/or different muffler.
 

Rocket Man

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I honestly never heard of a drain hole in a muffler. I guess you’re never too old to learn. None of the aftermarket ones I’ve bought had one afaik.
 

Geoffsfas10

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yeah the OEM mufflers have the drains in them. For whatever reason they condense and make water like its their job. If i leave my tahoe idle in the driveway when its warm theres a HUGE puddle that drips from that spot on the muffler. Usually it drips more then the AC drain does
 

petethepug

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Denali & Esky has / had stainless exhaust system out to the tip. Not sure if base model was carbon steel or was ever made in ss.

The stainless **** on our Esky has the same grime accumulation as the **** in the pic. Without that drain / weep hole all the condensation the engine puts out would accumulate, weigh a ton and restrict flow.


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