Print Page - What’s with the indentation on the GM mufflers?

Title: What’s with the indentation on the GM mufflers?
Post by: Barn Owl on June 24, 2007, 08:10:58 PM

I have had this question ever since I opened the tailgate on my bus: Why do the GM's have an indentation on the backside of their mufflers? It doesn't seem to be there for any clearance issues. I don't know how many models used them, but I have seen them on the 4106s and 4107s.

Just want to know.

Laryn

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Ncbob on June 25, 2007, 06:29:41 PM

You can't imagine how I honestly tried to balance the ying and yang of this question before bringing myself to ask one myself........

Could it be the result of the push starts from MCI's?

Egads! Am I ever going to get flamed for that one!

Bob

Title: Re: What’s with the indentation on the GM mufflers?
Post by: FloridaCliff on June 25, 2007, 06:37:31 PM

Bob,

You better be sleeping with one eye open!!!!!!!! 8)

I thought you would be over that GM jealousy by now...LOL ;D

Remember as I said the other day " the only thing that could be improved on your MCI-5 was if it had a GMC emblem" :-* :-* :-*

Cliff

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Dallas on June 25, 2007, 07:04:35 PM

Bob,

Keep Your GM ALL GM!

Title: Re: What’s with the indentation on the GM mufflers?
Post by: kyle4501 on June 25, 2007, 07:44:09 PM

Ole Bob is just jealous of GM's.

I'll bet he really wants a scenicruiser ;D

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Utahclaimjumper on June 25, 2007, 07:48:17 PM

I went out and checked my 06 muffler. no indentations, perfect cylinder top to bottom.>>>Dan

Title: Re: What’s with the indentation on the GM mufflers?
Post by: superpickle on June 25, 2007, 08:14:50 PM

:)........... :).............. Please continue the petty bickering ...... ;D

Title: Re: What’s with the indentation on the GM mufflers?
Post by: kyle4501 on June 25, 2007, 08:35:54 PM

Hey Bob, if mci's are so great, how did all the GMC's get in front?

;D ;D ;D

Title: Re: What’s with the indentation on the GM mufflers?
Post by: RJ on June 25, 2007, 11:13:33 PM

Quote from: kyle4501 on June 25, 2007, 08:35:54 PM

Hey Bob, if mci's are so great, how did all the GMC's get in front?

Easy, Kyle - alphabetical :D :D :D :D

Title: Re: What’s with the indentation on the GM mufflers?
Post by: kyle4501 on June 26, 2007, 06:44:02 AM

Quote from: Russ on June 25, 2007, 11:13:33 PM
Easy, Kyle - alphabetical :D :D :D :D

Waht if yuor'e dyslexic?

BTW Bob's in NC, are you sure he can spell? ;D ;D

Title: Re: What’s with the indentation on the GM mufflers?
Post by: uncle ned on June 26, 2007, 06:47:26 AM

Looked at the muffler on my 04, no indention but kept looking up it and found a couple old mci's. cleaned them out and cured my heating problems. been hunting that problem for years.

uncle ned
"Huggy Bear"

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Dallas on June 26, 2007, 07:58:08 AM

My 2¢.....

I think the indentation is from some mechanic sitting down there banging his head and trying to figure out what the previous guy did to get it into this condition.

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Hi yo silver on June 26, 2007, 12:52:04 PM

Ya See, Laryn...
I told ya there were lots of helpful and intelligent guys on this board! ...I'm sitting here grinning and shaking my head...he! he!

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Buffalo SpaceShip on June 26, 2007, 02:36:11 PM

Laryn... OK, seriously. My old '06 did not have "the dent" and my current '08's is so far up and back behind the engine I'd never know if it did, but I have seen my fair share of "dented" ones in pics that it must have been an option or factory alteration at some point. Maybe to provide clearance for lid actuators or something.

There's a few GMC buses on eBay right now that indeed have "the dent".

FWIW,
Brian B.

Title: Re: What’s with the indentation on the GM mufflers?
Post by: Barn Owl on June 26, 2007, 08:54:07 PM

I think the ones without the dent are not OEM mufflers. My manual shows the dent. I have seen a few without, but thats not the norm for what I have seen. Your right, I've been thinking too hard! :P

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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Barn Owl on June 24, 2007, 08:10:58 PM