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      02-17-2013, 06:17 PM   #1
robc1976
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What is this??

I have this on my exhaust and it looks like something that mounts somewhere but is not connected to anything, what is it??

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      02-17-2013, 06:21 PM   #2
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Suspect it's there to tune out a drone or resonance.

Neil
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      02-17-2013, 06:23 PM   #3
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Quote:
Originally Posted by MDORPHN View Post
Suspect it's there to tune out a drone or resonance.

Neil
I was thinking that to, vibration or drone, guess I wont cut it off LOL!!
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      02-17-2013, 06:26 PM   #4
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Muffler bearing.
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      02-17-2013, 06:34 PM   #5
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I want to play.

Coat hanger.
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      02-17-2013, 07:58 PM   #6
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A black oversized exhaust gumdrop?
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      02-17-2013, 08:08 PM   #7
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Quote:
Originally Posted by Dmacc View Post
A black oversized exhaust gumdrop?
lol!!!
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      02-17-2013, 08:09 PM   #8
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Quote:
Originally Posted by Fully_Bolted View Post
Muffler bearing.
That far back? Well, that explains why it is not attached...I don't have any lol!!
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      02-17-2013, 10:41 PM   #9
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Quote:
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Muffler bearing.
exactly what I was thinking
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      02-17-2013, 10:54 PM   #10
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Quote:
Originally Posted by cwarren View Post
exactly what I was thinking
What does this to...I will admit....I have owned many cars and have never heard of this lol!!
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      02-17-2013, 10:58 PM   #11
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Quote:
Originally Posted by cwarren View Post
exactly what I was thinking
It does look like one I must admit, whatever it is it is coming off.
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      02-17-2013, 11:02 PM   #12
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I believe that it is akin to a helmholtz chamber -- in that it is used to tune out certain acoustic properties -- and I've seen them on the exhausts of quite a few BMWs.

Unless shaving a small amount of weight is of critical importance, I'd leave it.

Neil
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      02-17-2013, 11:13 PM   #13
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Quote:
Originally Posted by MDORPHN View Post
I believe that it is akin to a helmholtz chamber -- in that it is used to tune out certain acoustic properties -- and I've seen them on the exhausts of quite a few BMWs.

Unless shaving a small amount of weight is of critical importance, I'd leave it.

Neil
yep, it is a vibration absorber:

http://www.e90post.com/forums/showthread.php?t=1579
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      02-17-2013, 11:14 PM   #14
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my question is why is your exhaust dropped
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      02-17-2013, 11:17 PM   #15
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Quote:
Originally Posted by sammy_0559 View Post
my question is why is your exhaust dropped
rogue engineering upgraded transmission mounts, powerflex subframe bushings, DEFIV lockdown differential kit, Wavetrac....busy week!!

http://www.e90post.com/forums/showthread.php?t=804839

http://www.e90post.com/forums/showthread.php?t=802073

Lock-down differential DIY coming!
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      02-17-2013, 11:22 PM   #16
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Quote:
Originally Posted by MDORPHN View Post
I believe that it is akin to a helmholtz chamber -- in that it is used to tune out certain acoustic properties -- and I've seen them on the exhausts of quite a few BMWs.

Unless shaving a small amount of weight is of critical importance, I'd leave it.

Neil
My exhaust is completely divorced (no resonator and no mufflers) so only one pipe has it lol!!
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      02-17-2013, 11:22 PM   #17
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Quote:
Originally Posted by robc1976 View Post
rogue engineering upgraded transmission mounts, powerflex subframe bushings, DEFIV lockdown differential kit, Wavetrac....busy week!!
then track

dude get that Alpina B3 TCU software flash
it will save ur tranny in the long run and it should shift better
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      02-17-2013, 11:23 PM   #18
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Quote:
Originally Posted by sammy_0559 View Post
then track

dude get that Alpina B3 TCU software flash
it will save ur tranny in the long run and it should shift better
Terry's flash has a shifting fix to...I have a level 10 tranny possibly coming soon.
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      02-17-2013, 11:30 PM   #19
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Terry's flash has a shifting fix to...I have a level 10 tranny possibly coming soon.
this flash is gonna be better and ur getting a level 10 already... I'm jelly lol hope you don't beat me to the trans removal diy but if you do your diy will be better
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      02-17-2013, 11:49 PM   #20
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Quote:
Originally Posted by sammy_0559 View Post
this flash is gonna be better and ur getting a level 10 already... I'm jelly lol hope you don't beat me to the trans removal diy but if you do your diy will be better
I am not getting one to soon....my tranny has less than 12,000 miles on it.you DIY will be great man!
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      02-17-2013, 11:53 PM   #21
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Quote:
Originally Posted by robc1976 View Post
I have this on my exhaust and it looks like something that mounts somewhere but is not connected to anything, what is it??

It absorbs acoustical vibration.
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      02-18-2013, 12:06 AM   #22
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Quote:
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It absorbs acoustical vibration.
Jeff OT but do you have any ER CF N54 engine covers in stock?
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