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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Anyone wondering what inside a stock muffler looks like? (pics inside)



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      01-06-2013, 11:56 PM   #1
sammy_0559
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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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      01-07-2013, 12:08 AM   #2
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Looks like a bunch of dead, burned up pidgeons, lol.
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      01-07-2013, 12:49 AM   #3
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holy shit i thought there was a dead cat in there.
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      01-07-2013, 03:18 AM   #4
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Haha nice... should have done this with the exhaust sitting in my garage years ago...

Cool post!
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      01-07-2013, 07:55 AM   #5
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i think a raccoon got inside your muffler
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      01-07-2013, 08:49 AM   #6
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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, 08:54 AM   #7
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Quote:
Originally Posted by subbie79 View Post
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...
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      01-07-2013, 09:15 AM   #8
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Quote:
Originally Posted by SfValley335i View Post
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
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      01-07-2013, 10:41 AM   #9
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Quote:
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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!!!
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      01-07-2013, 12:39 PM   #10
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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, 02:24 PM   #11
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
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
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      01-07-2013, 02:56 PM   #12
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Quote:
Originally Posted by sammy_0559
Quote:
Originally Posted by Jeff@TopGearSolutions View Post
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.
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      01-07-2013, 03:47 PM   #13
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Quote:
Originally Posted by sammy_0559 View Post
no not yet. my car is still broken but if it does sound like a tin can im gonna
Quote:
Originally Posted by e92ben View Post
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.
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      01-07-2013, 05:23 PM   #14
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      01-07-2013, 06:03 PM   #15
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Quote:
Originally Posted by e60oholic
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
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      01-08-2013, 11:14 AM   #16
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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.
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      01-08-2013, 11:23 AM   #17
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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.

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      01-08-2013, 11:48 AM   #18
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Quote:
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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?
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      01-08-2013, 01:38 PM   #19
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It would be more interestng if there are sound clips on the catless DPs ....
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      01-09-2013, 05:53 AM   #20
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Quote:
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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:
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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.
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      01-09-2013, 07:13 AM   #21
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