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      01-08-2013, 01:44 PM   #45
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Quote:
Originally Posted by Artemis View Post
Please elaborate. IMHO it is better to steer clear from a cut-and-weld operation re the N54 mids (removal of the secondary cats), if that's what you plan to do.

Got to check the exact price, but from recollection, for the price of one set of N54 mids you can buy 4 or 5 sets of N55 mids. The reason: secondary cats ain't cheap. Don't castrate those dangly bits. Save yourself the hassle, install N55 mids (moreover it's an OEM BMW part) and keep the stock N54 mids for future re-installation purposes (you might be required to re-install N54 mids on resale day - buying those will hurt your wallet). N55 mids are also cheaper than Maddad mids.
TRACKING ... I have to look in to the price on the N55 Mids; I made a premature statement based on the idea that everything BMW sells is expensive as hell. I'm getting ready to put Cat-less DP's on, and I'm currently rocking the Berk Race axle back (which I hate); so I'm thinking about doing a custom MP or the N55 mid if the price is reasonable.
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      01-08-2013, 01:47 PM   #46
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Quote:
Originally Posted by 011100001 View Post
TRACKING ... I have to look in to the price on the N55 Mids; I made a premature statement based on the idea that everything that BMW sells is expensive as hell. I'm getting ready to put Cat-less DP's on, and I'm currently rocking the Berk Race axle back (which I hate); so I'm thinking about doing a custom MP or the N55 mid if the price is reasonable.
Almost two years ago when I bought my N55 mids they were 330 euros from my Germany dealer(w/o tax). When the 2011's N55 cars came out the N55 mids were over 400 euros. I think they are now under 300 euros for the N55 mids. You should get new front and rear exhaust gaskets and those bolts/springs - just to be safe when doing your install. That will add about another 60 euros in hardware and gaskets.

The 1M mid pipe with secondary cats is over 2,100 euros!
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      01-08-2013, 02:06 PM   #47
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Quote:
Originally Posted by Dackelone View Post
The 1M mid pipe with secondary cats is over 2,100 euros!
for a stock exhaust... WTF! At that rate I'll have to start selling blood to break 400WHP! lol jkjk
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      01-08-2013, 02:09 PM   #48
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Quote:
Originally Posted by 011100001 View Post
for a stock exhaust... WTF! At that rate I'll have to start selling blood to break 400WHP! lol jkjk
That is only for the stock 1M mid pipes! The entire exhaust will cost you much more!!


Yea... buy some N55 mid pipes.
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      01-08-2013, 02:21 PM   #49
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Quote:
Originally Posted by Dackelone View Post
That is only for the stock 1M mid pipes! The entire exhaust will cost you much more!!


Yea... buy some N55 mid pipes.
I think I will; I'll keep my eyes peeled on ebay and craigstlist before I go to the stealership though...
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      01-08-2013, 03:11 PM   #50
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Quote:
Originally Posted by 011100001 View Post
TRACKING ... I have to look in to the price on the N55 Mids; I made a premature statement based on the idea that everything BMW sells is expensive as hell. I'm getting ready to put Cat-less DP's on, and I'm currently rocking the Berk Race axle back (which I hate); so I'm thinking about doing a custom MP or the N55 mid if the price is reasonable.
See these threads:
http://www.1addicts.com/forums/showthread.php?t=651547
http://www.1addicts.com/forums/showthread.php?t=662265
http://www.1addicts.com/forums/showthread.php?t=709182
http://www.1addicts.com/forums/showthread.php?t=677414

N55 (no secondary cats) = BMW part # 18307599743
For the OEM bolts and gaskets part #, see these earlier posts of Dackel:
http://www.1addicts.com/forums/showp...02&postcount=8
http://www.1addicts.com/forums/showp...1&postcount=16

Call around for the N55 midpipes because some sellers over-charge. Normal price is sub $400.

N55 (left) versus N54 midpipes (right):
Name:  N55_N54_Midpipes.jpg
Views: 3033
Size:  92.0 KB

If you also change downpipes, the ECU will throw codes at you (detecting the absence of primary cats) which you need to deal with (no such thing if you only change mids) + might result into undesirable results (too loud, too smelly, trouble with authorities and neighbors). See for example:
http://www.1addicts.com/forums/showthread.php?t=787223
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      01-08-2013, 03:14 PM   #51
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^ I just picked up the CP-e DP fix today. Trust me I've been doing a little research on the whole DP thing...
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      01-08-2013, 03:53 PM   #52
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Arrow original 1M mid pipe dummy resonator...

I think I found a pic(s) of the factory 1M mid pipe resonator cut open. Like my German buddy told me... he sold his OE 1M mid pipe to a guy wanting a louder exhaust... so he cut open the resonator and was going to make a "straight pipe". But to his surprise... THAT is exactly what BMW had already done! So now we know why the stock exhaust drones a little bit!


Here are the pics I found on the web...
Name:  Midpipe-Mittelschalldaempfer-Original-BMW-N55-N54-135i-1M-High-Flow-Version_b3.jpg
Views: 2224
Size:  123.1 KB

Name:  Midpipe-Mittelschalldaempfer-Original-BMW-N55-N54-135i-1M-High-Flow-Version_b2.jpg
Views: 2274
Size:  93.2 KB
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      01-08-2013, 04:04 PM   #53
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That's a one hairy resonator Dack! What was BMW thinking, Hobbit?

Quote:
Originally Posted by Dackelone View Post
I think I found a pic(s) of the factory 1M mid pipe resonator cut open. Like my German buddy told me... he sold his OE 1M mid pipe to a guy wanting a louder exhaust... so he cut open the resonator and was going to make a "straight pipe". But to his surprise... THAT is exactly what BMW had already done! So now we know why the stock exhaust drones a little bit!


Here are the pics I found on the web...
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      01-08-2013, 05:36 PM   #54
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Quote:
Originally Posted by Dackelone View Post
So now we know why the stock exhaust drones a little bit!
Quote:
Originally Posted by ozinaldo View Post
That's a one hairy resonator Dack! What was BMW thinking, Hobbit?
Amazing, BMW got us blonde poodles inside our 1M resonators.

Actually, matches well with the "BMW Performance VO Steering Wheel Winter Cover".

Name:  VO_SteeringWheel.jpg
Views: 2124
Size:  23.5 KB
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      01-09-2013, 09:45 PM   #55
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Quote:
Originally Posted by Artemis View Post
Amazing, BMW got us blonde poodles inside our 1M resonators.

Actually, matches well with the "BMW Performance VO Steering Wheel Winter Cover".

Attachment 804685
Hilarious!
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      01-09-2013, 11:46 PM   #56
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Quote:
Originally Posted by Dackelone View Post
I think I found a pic(s) of the factory 1M mid pipe resonator cut open. Like my German buddy told me... he sold his OE 1M mid pipe to a guy wanting a louder exhaust... so he cut open the resonator and was going to make a "straight pipe". But to his surprise... THAT is exactly what BMW had already done! So now we know why the stock exhaust drones a little bit!
Great pics, Dack.

Have we confirmed if either the non-M N54 midpipes or the N55 midpipes have similar resonator construction?
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      01-10-2013, 06:39 AM   #57
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Quote:
Originally Posted by flzrider View Post
Great pics, Dack.

Have we confirmed if either the non-M N54 midpipes or the N55 midpipes have similar resonator construction?
I have not seen anyone posting pics like that to confirm. But I did take a picture of the INSIDE of my N55 mid pipe resonator... and the inner pipe did have perforation holes drilled into the inner pipe of the resonator.

IF anyone wants to cut up their stock n54 resonator... I would love to see whats inside the can/box!


Here is a pic of my N55 mid pipe...
Name:  n55 mid pipes IMG_4405.jpg
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      01-10-2013, 10:02 AM   #58
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I will once I get a hold of a N55 Mid-Pipe... Does anyone have a N55 mp laying around?
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      01-10-2013, 01:07 PM   #59
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Quote:
Originally Posted by Dackelone View Post
I have not seen anyone posting pics like that to confirm. But I did take a picture of the INSIDE of my N55 mid pipe resonator... and the inner pipe did have perforation holes drilled into the inner pipe of the resonator.

IF anyone wants to cut up their stock n54 resonator... I would love to see whats inside the can/box!


Here is a pic of my N55 mid pipe...
Based on that picture it seems likely that the N55 midpipe is a traditional resonator, which would make sense seeing as how it cures the drone issue on the 1M (plus a small bump in HP due to the lack of cats).

Great work as always, Dack!
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      10-04-2013, 06:47 AM   #60
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Just had my N54 midpipe replaced under motorplan due to loose cats inside the housing.

The midpipe alone without the gaskets and labour cost R36000.00 ($3606,84)
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      04-25-2014, 01:14 PM   #61
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Quote:
Originally Posted by Smiley1175 View Post
I removed one restriction but added in another.
I don't believe a perforated pipe would add restriction. If anything, it would act as a hemholtz resonator and smooth out the exhaust pulse and dampen the soundwave, but without adding restriction.
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      04-25-2014, 04:07 PM   #62
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Quote:
Originally Posted by Dackelone View Post
I think I found a pic(s) of the factory 1M mid pipe resonator cut open. Like my German buddy told me... he sold his OE 1M mid pipe to a guy wanting a louder exhaust... so he cut open the resonator and was going to make a "straight pipe". But to his surprise... THAT is exactly what BMW had already done! So now we know why the stock exhaust drones a little bit!


Here are the pics I found on the web...
Attachment 804646

Attachment 804647
I wish we could find out who took these photos. If you look closely at the pipe in the smaller chamber, it looks like a hack weld job of a band covering where perforated holes may have existed, as seen in photos of unmodified 135i resonators. Are we certain this is a stock unmodified resonator? In the days of cutting costs, it seems odd that BMW would go through the extra work and expense of making a dummy resonator, especially when they offer an performance exhaust system for the 135i that has a y pipe in place of the resonator.
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      04-25-2014, 05:31 PM   #63
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Quote:
Originally Posted by keithbickford View Post
I wish we could find out who took these photos. If you look closely at the pipe in the smaller chamber, it looks like a hack weld job of a band covering where perforated holes may have existed, as seen in photos of unmodified 135i resonators. Are we certain this is a stock unmodified resonator? In the days of cutting costs, it seems odd that BMW would go through the extra work and expense of making a dummy resonator, especially when they offer an performance exhaust system for the 135i that has a y pipe in place of the resonator.
I know who took them: the friend of MY friend, that's who. Yes, I am certain it's a legit photo.

But hey.... why not take off your factory mid pipe and cut it apart? Then you will know for sure.



Only cars to get a "different" exhaust are the cars built for the Chinese market. Those car's get a quieter exhaust and only two of the four tail pipes really work. The other two are "dummies". There was an old thread when the 1M first came out how the inner(?) exhaust pipes were clean while the outer ones were dirty on Chinese market cars.


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      04-26-2014, 01:40 AM   #64
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Quote:
Originally Posted by keithbickford View Post
I wish we could find out who took these photos. If you look closely at the pipe in the smaller chamber, it looks like a hack weld job of a band covering where perforated holes may have existed, as seen in photos of unmodified 135i resonators. Are we certain this is a stock unmodified resonator? In the days of cutting costs, it seems odd that BMW would go through the extra work and expense of making a dummy resonator, especially when they offer an performance exhaust system for the 135i that has a y pipe in place of the resonator.
Photos are legit..

Place a 135i/N54 mid pipe alongside a 1M mid pipe and shine a torch in the resonator exit..

No rocket science needed here, the difference is quiet obvious.
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      04-29-2014, 12:54 PM   #65
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Was there a pun in "quiet obvious"
In seeing the photos of all the variations, It seems they all have an internal Y pipe, but the non 1M cars have perforations in the collector to allow resonances to dissipate into the wool, whereas the 1M has the same Y pipe without perforations. The question is whether allowing the resonances to be absorbed into the wool actually limits power in any way. It seems to me that it would be effective at reducing resonance (drone) but not rob power.

Last edited by keithbickford; 04-29-2014 at 01:00 PM..
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      10-31-2014, 08:03 AM   #66
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Does anyone know what the effect would be of having the N55 midpipe combined with the 1M fake resonator?

Would it influence power at all?
Would there be more/better noise?
What would happen to the drone?
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