Equal-length exhaust discussion: new S55 sounds

[bmwmdistrict]

I'm about to buy the AA EL midpipe and based on the feedback in here I'll buy direct from AA.

[jeepin29]

Originally Posted by Blessm

That's when I ordered mine and still no shipping info. Called again today, same response as last Friday: "we'll call the manufacturer and get back to you".

My order date was Nov 23 if that helps at all - not sure how busy they got with Black Friday promos.

[BMa703]

I bought mine during the Black Friday sale from xph. Just got the shipping notification today and it will be here this Wednesday! 😎

[Blessm]

Originally Posted by BMa703

I bought mine during the Black Friday sale from xph. Just got the shipping notification today and it will be here this Wednesday! 😎

I just got my confirmation also!

[mike@x-ph.com]

Originally Posted by BMa703

I bought mine during the Black Friday sale from xph. Just got the shipping notification today and it will be here this Wednesday! 😎

Originally Posted by Blessm

I just got my confirmation also!

[Envy ///M3]

Originally Posted by mike@x-ph.com

Sent you an email yesterday Mike. I ordered my AA EQ mid Nov 20th. Anyway you can get back to me? Order #56417

[mike@x-ph.com]

Originally Posted by Envy ///M3

Sent you an email yesterday Mike. I ordered my AA EQ mid Nov 20th. Anyway you can get back to me? Order #56417

Hi,
For a faster response, please dm me instead of posting on a thread.

I saw your email to support and responded to it just now

[Redacre]

A very large box from AA via XPH just arrived, patience friends

[Envy ///M3]

Originally Posted by mike@x-ph.com

Hi,
For a faster response, please dm me instead of posting on a thread.

I saw your email to support and responded to it just now

Nevermind, my exhaust actually came in today! Thanks guys!

[kaiv]

I feel like I'm the only one who hasn't gotten his exhaust

[TheMaster1971NL]

Originally Posted by kaiv

I feel like I'm the only one who hasn't gotten his exhaust

me too

[mike@x-ph.com]

Originally Posted by Envy ///M3

Nevermind, my exhaust actually came in today! Thanks guys!

Congrats

Originally Posted by kaiv

I feel like I'm the only one who hasn't gotten his exhaust

Originally Posted by TheMaster1971NL

me too

Everyone will get their exhausts soon, Active is processing the orders as fast as possible.

[RugbyBro]

Great video on the concept of equalizing sound pulses

[jeepin29]

I just got my mid pipe installed yesterday, but think I need to get it adjusted as I’m getting a lot of vibration and think it’s hitting.

[RugbyBro]

Originally Posted by jeepin29

I just got my mid pipe installed yesterday, but think I need to get it adjusted as I’m getting a lot of vibration and think it’s hitting.

Did the shop install new exhaust gaskets? You can get a nasty vibration (especially on startup) that resonates through the car originating from the mating point between the midpipe and the down pipes if these weren’t installed or seated correctly. If it’s not that, then it’s likely touching somewhere

[jeepin29]

Originally Posted by RugbyBro

Did the shop install new exhaust gaskets? You can get a nasty vibration (especially on startup) that resonates through the car originating from the mating point between the midpipe and the down pipes if these weren’t installed or seated correctly. If it’s not that, then it’s likely touching somewhere

I did not supply any, so I’m guessing not. I’m not sure if they tried to reuse the originals, but will verify tomorrow.

Would these be the correct replacements? https://www.ecstuning.com/b-elring-p...307851168~elr/

[RugbyBro]

Originally Posted by jeepin29

I did not supply any, so I’m guessing not. I’m not sure if they tried to reuse the originals, but will verify tomorrow.

Would these be the correct replacements? https://www.ecstuning.com/b-elring-p...307851168~elr/

Yes those are them, I'd buy two just to replace both. The original gaskets can get stuck to the original mid-pipe or get damaged in the process of removal.

At about 1:09 of this vid you will hear what the rattle/vibration sounds like. You do not need to replace the metal gasket or bolts like Tommy did, just the actual exhaust gaskets.

[jeepin29]

Originally Posted by RugbyBro

Yes those are them, I'd buy two just to replace both. The original gaskets can get stuck to the original mid-pipe or get damaged in the process of removal.

At about 1:09 of this vid you will hear what the rattle/vibration sounds like. You do not need to replace the metal gasket or bolts like Tommy did, just the actual exhaust gaskets.

I got the car up on ramps today, and did not have the same rattle at the down pipe connection.

I did notice that there is was some water leaking from where the mid pipe meets the muffler, but the clamps seem pretty tight. I also wiggled the piping and didn’t hear it contacting anything other than one spot where the muffler hits a thin piece of metal behind the center of the diffuser. I’m going to loosen the mid to muffle clamps and adjust to see if that helps at all.

[matty088]

Do you get smell from removing the rear cats? What about passing emissions? A cel?

[matty088]

Originally Posted by RugbyBro

Did the shop install new exhaust gaskets? You can get a nasty vibration (especially on startup) that resonates through the car originating from the mating point between the midpipe and the down pipes if these weren’t installed or seated correctly. If it’s not that, then it’s likely touching somewhere

Does the gasket come in the kit? How many gaskets are needed ?

[RugbyBro]

Originally Posted by matty088

Does the gasket come in the kit? How many gaskets are needed ?

No gaskets come with the kit, you need to supply your own. They’re quite cheap (like $10 a gasket) and I personally wouldn’t reuse an old one. I’ve noticed that once they’re sealed and have been exposed to enough heat, you aren’t likely to pull it off completely intact. Jeepin posted a link earlier to the gaskets - they’re also known as “exhaust silencers” in BMW lingo

Edit: you need 2 gaskets, one for each downpipe

[RugbyBro]

Originally Posted by jeepin29

I got the car up on ramps today, and did not have the same rattle at the down pipe connection.

I did notice that there is was some water leaking from where the mid pipe meets the muffler, but the clamps seem pretty tight. I also wiggled the piping and didn’t hear it contacting anything other than one spot where the muffler hits a thin piece of metal behind the center of the diffuser. I’m going to loosen the mid to muffle clamps and adjust to see if that helps at all.

Hmm is the vibration prevalent all the time or only on cold start? The DP rattle typically only happens when the metal is cold - once it’s hot it expands and forms a seal and the rattle will go away. The gaskets act to fill that space in between the pipes all the time so there is never any rattle. It can also be due to loose bolts at the DP.

If it’s not DP related and there’s no visible touching then I’d check all the clap points to make sure they’re cinched down correctly/tightly. I’m not exactly sure what else would cause it in the exhaust chain if it isn’t any of those things. Anyone else have ideas/input?