Anyone wondering what inside a stock muffler looks like? (pics inside)

sammy_0559 · 01-06-2013, 10:56 PM

So after this backfiring happened i noticed weird stuff coming out my exhaust.
thread to backfiring.
http://www.e90post.com/forums/showthread.php?t=788425

anyways i dropped the exhaust yesterday and took it to my buddies house where we wanted cut the cats open and check on the or remove them because they sounded like they were screwed.
long story short we cut the secondaries open and there was nothing in there!! lol

so we thought it might be piled up in the muffler so we cut the muffler open and i guess we cut too short. but on the uncut side i think contains padding and straight pipe with holes in it, but the cats probably passed right through it. so I'm going to weld it up tomorrow morning and re install it on the car
in the mean time here is a pic of the the progress

enjoy.

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Tim M · 01-06-2013, 11:08 PM

Looks like a bunch of dead, burned up pidgeons, lol.

idrift4wd · 01-06-2013, 11:49 PM

holy shit i thought there was a dead cat in there.

Sick335 · 01-07-2013, 02:18 AM

Haha nice... should have done this with the exhaust sitting in my garage years ago...

Cool post!

demontwinz · 01-07-2013, 06:55 AM

i think a raccoon got inside your muffler

subbie79 · 01-07-2013, 07:49 AM

I wonder if that secondary car converter is really a cat converter. Just by looking at the picture it looks more like a resonator.

SfValley335i · 01-07-2013, 07:54 AM

Quote:

Originally Posted by subbie79

I wonder if that secondary car converter is really a cat converter. Just by looking at the picture it looks more like a resonator.

It really is a cat, OP might have shot his out if he has 2step or something...

sammy_0559 · 01-07-2013, 08:15 AM

Quote:

Originally Posted by SfValley335i

It really is a cat, OP might have shot his out if he has 2step or something...

I'm AT, i shot it out with the issues I'm having lol i might have abused the issues a bit

robc1976 · 01-07-2013, 09:41 AM

Quote:

Originally Posted by Doc K

Looks like a bunch of dead, burned up pidgeons, lol.

I literally almost fell out of my seat and spit coffee all over my PC screen ROFLMAO!!!

Jeff@TopGearSolutions · 01-07-2013, 11:39 AM

Looks like a perforated core and fiberglass or something. That's why most cat back's don't add too much power, it's already a pretty good exhaust from the factory.

Without that packing it might sound like a tin can though. Have you driven it?

sammy_0559 · 01-07-2013, 01:24 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Looks like a perforated core and fiberglass or something. That's why most cat back's don't add too much power, it's already a pretty good exhaust from the factory.

Without that packing it might sound like a tin can though. Have you driven it?

no not yet. my car is still broken

but if it does sound like a tin can im gonna

e92ben · 01-07-2013, 01:56 PM

Quote:

Originally Posted by sammy_0559

Quote:

Originally Posted by Jeff@TopGearSolutions

Looks like a perforated core and fiberglass or something. That's why most cat back's don't add too much power, it's already a pretty good exhaust from the factory.

Without that packing it might sound like a tin can though. Have you driven it?

no not yet. my car is still broken

but if it does sound like a tin can im gonna

Think you'll like it without padding or minimal. The 335is muffler sounds dope and its the oem muffler without much of the padding.

Jeff@TopGearSolutions · 01-07-2013, 02:47 PM

Quote:

Originally Posted by sammy_0559

no not yet. my car is still broken

but if it does sound like a tin can im gonna

Quote:

Originally Posted by e92ben

Think you'll like it without padding or minimal. The 335is muffler sounds dope and its the oem muffler without much of the padding.

Definitely curious. It might just be the happy medium from a muffler delete as those tend to drone a lot. If anything it may be a bit raspy.

e92oholic · 01-07-2013, 04:23 PM

http://www.e90post.com/forums/showthread.php?t=250659

sammy_0559 · 01-07-2013, 05:03 PM

Quote:

Originally Posted by e60oholic

http://www.e90post.com/forums/showthread.php?t=250659

Cool, so this has been done before maybe if opened up the other side would've been a good idea but oh we'll

padding and muffler thing is in the other part. Might sound uniqe. But we shall see

Gugs · 01-08-2013, 10:14 AM

Quote:

Originally Posted by SfValley335i

It really is a cat, OP might have shot his out if he has 2step or something...

They are resonators. There are no secondary cats as the newbs/lemmings seem to think.

N111CUK · 01-08-2013, 10:23 AM

ok I have some important info for UK owners.

I have catless DP and stock exhaust so in theory I have no cats at all.

Well I passed my MOT test with the same results as stock DP.

Anyone worried about no cats well I say go for it UK testers will pass the car in any case.

ign335i · 01-08-2013, 10:48 AM

Quote:

Originally Posted by e92ben

Think you'll like it without padding or minimal. The 335is muffler sounds dope and its the oem muffler without much of the padding.

How does it sound with catless DPs though?

Red_Bean_Bun · 01-08-2013, 12:38 PM

It would be more interestng if there are sound clips on the catless DPs ....

SuperBmw · 01-09-2013, 04:53 AM

Quote:

Originally Posted by Gugs

They are resonators. There are no secondary cats as the newbs/lemmings seem to think.

You are the newb/lemming.
Those are not resonators, they are catalytic converters. Cut an intact one open and it will be BEYOND obvious that it is not a resonator and is indeed a catalytic converter

Quote:

Originally Posted by e92ben

Think you'll like it without padding or minimal. The 335is muffler sounds dope and its the oem muffler without much of the padding.

It's a bit more different than that actually, that's why removing packing material doesn't achieve the same sound.

ken1137 · 01-09-2013, 06:13 AM

NASTY!

01-06-2013, 10:56 PM	#1
sammy_0559 Lieutenant Colonel 202 Rep 1,950 Posts Drives: 335i Join Date: Apr 2011 Location: FortWorth, Texas iTrader: (2) Garage List 2008 E93 335i [3.66]	Anyone wondering what inside a stock muffler looks like? (pics inside) So after this backfiring happened i noticed weird stuff coming out my exhaust. thread to backfiring. http://www.e90post.com/forums/showthread.php?t=788425 anyways i dropped the exhaust yesterday and took it to my buddies house where we wanted cut the cats open and check on the or remove them because they sounded like they were screwed. long story short we cut the secondaries open and there was nothing in there!! lol so we thought it might be piled up in the muffler so we cut the muffler open and i guess we cut too short. but on the uncut side i think contains padding and straight pipe with holes in it, but the cats probably passed right through it. so I'm going to weld it up tomorrow morning and re install it on the car in the mean time here is a pic of the the progress enjoy.
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01-06-2013, 11:08 PM	#2
Tim M Just a regular guy. 60 Rep 514 Posts Drives: Alpine White M3 Sedan Join Date: Feb 2011 Location: CA iTrader: (2)	Looks like a bunch of dead, burned up pidgeons, lol.
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01-06-2013, 11:49 PM	#3
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	holy shit i thought there was a dead cat in there.
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01-07-2013, 02:18 AM	#4
Sick335 Major 88 Rep 1,174 Posts Drives: 335i / X6M Join Date: Oct 2011 Location: Woodland Hills, CA iTrader: (2)	Haha nice... should have done this with the exhaust sitting in my garage years ago... Cool post!
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01-07-2013, 06:55 AM	#5
demontwinz Lieutenant 18 Rep 456 Posts Drives: 335i e92 Join Date: Sep 2012 Location: Toronto iTrader: (0)	i think a raccoon got inside your muffler __________________
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01-07-2013, 07:49 AM	#6
subbie79 Banned 3 Rep 25 Posts Drives: 2007 335i Sedan Join Date: May 2012 Location: Bellevue WA iTrader: (0)	I wonder if that secondary car converter is really a cat converter. Just by looking at the picture it looks more like a resonator.
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01-07-2013, 11:39 AM	#10
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Looks like a perforated core and fiberglass or something. That's why most cat back's don't add too much power, it's already a pretty good exhaust from the factory. Without that packing it might sound like a tin can though. Have you driven it?
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01-07-2013, 04:23 PM	#14
e92oholic Banned 66 Rep 850 Posts Drives: 2013 MINI JCW GP Join Date: Feb 2012 Location: Buffalo NY iTrader: (6)	http://www.e90post.com/forums/showthread.php?t=250659
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01-08-2013, 10:23 AM	#17
N111CUK G force Junkie 36 Rep 262 Posts Drives: 335i M Sport black edition Join Date: Jun 2012 Location: United kingdom iTrader: (0) Garage List 2007 BMW E92 335i N ... [10.00]	ok I have some important info for UK owners. I have catless DP and stock exhaust so in theory I have no cats at all. Well I passed my MOT test with the same results as stock DP. Anyone worried about no cats well I say go for it UK testers will pass the car in any case.
	Appreciate 0 Quote

01-08-2013, 12:38 PM	#19
Red_Bean_Bun Captain 62 Rep 944 Posts Drives: E92 Join Date: Nov 2009 Location: Montreal iTrader: (4)	It would be more interestng if there are sound clips on the catless DPs ....
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01-09-2013, 06:13 AM	#21
ken1137 Brigadier General 89 Rep 3,732 Posts Drives: BMW S1000XR Join Date: Jun 2011 Location: Gilbert, AZ iTrader: (7) Garage List 2009 e90 335i [6.40]	NASTY! __________________ BMWCCA member
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