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      10-31-2014, 08:03 AM   #67
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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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      10-31-2014, 05:16 PM   #68
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Quote:
Originally Posted by DiCampo View Post
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?
^^That would basically be a straight pipe. It would be very loud. And yes, it would drone - a lot - I think.


Here is a friend of mine @JK135i with a N54, 135i... his exhaust at this time had a aftermarket muffler with a straight pipe/mid. Maybe he will chime in on this thread... Anyways his car was loud! So loud you could hear him a few km's away!

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      12-11-2014, 08:23 PM   #69
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Quote:
Originally Posted by Stan.mac View Post
Does any know of anybody completely changing the mid-pipes on the N54? I had a wild thought and was wondering if someone might have done this already... Being that I already have the Berk Muffler Delete Pipe installed, converting the mid-pipe into one 3.5" exhaust. To accomplish this I would have a "Y" pipe installed immediately after the down pipes collecting into a 3.5" exhaust. it seems like this would be a bit more manageable underneath the vehicle and remove all of the exhaust restrictions after the DP's.
Two small(dia) pipes flow more than one large pipe.

There is a reason why BMW does certain things.
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      12-12-2014, 11:57 AM   #70
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Wanting to quiet the resonances at 2300 and 2800 rpm, I replaced the y-pipe in my 1M with the resonator from Dack's 135.
It turned down the resonances a bit, but they are still there. More acceptable for my money, but still mildly annoying.
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      12-12-2014, 04:01 PM   #71
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Quote:
Originally Posted by EldRick View Post
Wanting to quiet the resonances at 2300 and 2800 rpm, I replaced the y-pipe in my 1M with the resonator from Dack's 135.
It turned down the resonances a bit, but they are still there. More acceptable for my money, but still mildly annoying.
Ohh man, really? I was hoping it would get rid of your resonance. Maybe try some sound proofing(DynaMat) under the trunk carpet, next to the Mluf(blue tooth) com box.

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      12-12-2014, 06:14 PM   #72
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Quote:
I was hoping it would get rid of your resonance.
Me too, but it just damped it a bit. It's not nearly as annoying, but it's still there.

I had already done the dynamat thing in the trunk (with a lot more than you used, and a carpet scrap to fill the area flush) with only slight improvement.
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      12-12-2014, 08:22 PM   #73
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Only way to get rid of it -- as opposed to simply dampening the noise a bit -- would be with a tuned helmholtz resonator.

Some very high end exhausts (perhaps Akrapovic) have them as integral part of their systems.

Neil
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      12-14-2014, 08:44 AM   #74
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Try the N55 midpipe.
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      12-14-2014, 12:02 PM   #75
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This is essentially the N55 mid-pipe with two add'l cats. Should be quieter than a 135, theoretically.

Last edited by EldRick; 12-14-2014 at 03:25 PM..
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      12-25-2014, 04:43 PM   #76
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Would adding the akra and wireless not help with the drone?
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      05-10-2015, 05:02 PM   #77
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Resonator update

Update on the 135 y-resonator:

I'm pretty sure it's not just my ears, but over the 3000 miles it has been installed, my 1M (with Dack's 135 y-resonator) has become considerably less noisy, and the resonances at 2300 and 2800 rpm are now greatly reduced.

When the 135 y-pipe was first installed, I was a bit disappointed that it didn't reduce exhaust noise more, but at this point it is acceptable. To me it sounds like a BMW 6 is supposed to sound - normally muted in driving around town, but developing a nice smooth snarl when wide open.

I don't have a good explanation for this, but I'm pretty sure the change is real. Maybe oil/carbon buildup on the pipes or on the stuffing makes it more effective at soaking up sound? Theories welcome...
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      05-11-2015, 01:36 AM   #78
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Quote:
Originally Posted by EldRick View Post
Update on the 135 y-resonator:

I'm pretty sure it's not just my ears, but over the 3000 miles it has been installed, my 1M (with Dack's 135 y-resonator) has become considerably less noisy, and the resonances at 2300 and 2800 rpm are now greatly reduced.

When the 135 y-pipe was first installed, I was a bit disappointed that it didn't reduce exhaust noise more, but at this point it is acceptable. To me it sounds like a BMW 6 is supposed to sound - normally muted in driving around town, but developing a nice smooth snarl when wide open.

I don't have a good explanation for this, but I'm pretty sure the change is real. Maybe oil/carbon buildup on the pipes or on the stuffing makes it more effective at soaking up sound? Theories welcome...

The change in sound, is real. It's the same thing forum members report after installing a PE. After a few thousand miles the tone of the exhaust changes. For me, I noticed this after 6K miles of driving. I believe its the carboning up of the exhaust that's responsible.

Dack
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      05-11-2015, 06:06 PM   #79
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I put the Mad Dad mids on last August and have driven about 6000 miles since then. The exhaust has finally "matured" after its first track day last month, noticeably more snarl now even with modest acceleration, half throttle. It is exactly what I had hoped for, finally!
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      05-13-2015, 03:57 PM   #80
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Akra + N55 mids: during 'spirited' Autobahn runs, after some time I start to hear a kind of 'double bass' whenever I floor the pedal. Hard to describe this phenomenon, but it sounds as if an extra rumble is added. Dies down when engine gets less stressed. Very likely heat-related.
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      05-18-2015, 06:34 PM   #81
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Artemis Have you checked the clearance around the exhaust when it's hot? Perhaps it is touching the body somewhere when it heats up?
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      05-24-2015, 04:54 PM   #82
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Quote:
Originally Posted by Artemis View Post
Akra + N55 mids: during 'spirited' Autobahn runs, after some time I start to hear a kind of 'double bass' whenever I floor the pedal. Hard to describe this phenomenon, but it sounds as if an extra rumble is added. Dies down when engine gets less stressed. Very likely heat-related.
I had the same felling the last time I did a few hard pulls. Sounded different a bit, as you said, it is probably heat-related
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      05-24-2015, 05:20 PM   #83
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Quote:
Originally Posted by EldRick View Post
Artemis Have you checked the clearance around the exhaust when it's hot? Perhaps it is touching the body somewhere when it heats up?
During my latest routine check when changing my wheels (Winter to Summer), I didn't notice anything abnormal. Clearance seemed OK - all still seemed well-connected. But, true, the exhaust system was not as hot as after a 'spirited' Autobahn run.

I may run a quick check next time at some exit of the Autobahn (though a bit complicated to spot anything, even when crawling a bit under it, as the car sits already low).

Don't underestimate the degree of heat flowing through the system when the car is seriously pushed.
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      11-18-2015, 08:32 PM   #84
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Quote:
Originally Posted by Dackelone View Post
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".
For the record:

BMW 1M midpipe: http://www.realoem.com/bmw/enUS/show...diagId=18_0770
  • RP-catalytic converters with muffler = BMW part# 18307845669 (13.60 kg) = BMW 1M worldwide except for China
  • RP-catalytic converters with muffler = BMW part# 18307559994 (13.60 kg) = BMW 1M China
Seel also the BMW 135i getting BMW part# 18307559994 (13.60 kg): http://www.realoem.com/bmw/enUS/part...994&series=E82

And also the difference regarding the BMW 1M axle back exhaust: http://www.realoem.com/bmw/enUS/show...diagId=18_0932
  • Rear muffler = BMW part# 18107845402 (11.71 kg) = BMW 1M worldwide except for China
  • Rear muffler = BMW part# 18107847100 (12.55 kg) (discontinued) + BMW part# 18307647119 (11.00 kg) = BMW 1M China
Quote:
Originally Posted by Dackelone View Post
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.
Here you go:
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      12-04-2015, 12:43 AM   #85
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Have a question regarding the secondary cats as I cannot find my answer anywhere, figured this is would be an appropriate place to get the info. ~How restrictive are the secondary cats? I read in some e90posts that the primary are 400 cell and the secondary are 200 cell. I understand the 1M OEM DPs are less restrictive. Not sure about the mid pipe section. It matters as I am tossing around the idea of ordering some HJS 100-200 cell race cats. If the OEM cats are 200s then I will use the OEM mids (fully catlless now) Thnx
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      12-04-2015, 03:41 AM   #86
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Quote:
Originally Posted by 1&done View Post
Have a question regarding the secondary cats as I cannot find my answer anywhere, figured this is would be an appropriate place to get the info. ~How restrictive are the secondary cats? I read in some e90posts that the primary are 400 cell and the secondary are 200 cell. I understand the 1M OEM DPs are less restrictive. Not sure about the mid pipe section. It matters as I am tossing around the idea of ordering some HJS 100-200 cell race cats. If the OEM cats are 200s then I will use the OEM mids (fully catlless now) Thnx
The 1M's midpipe(& secondary cats) are different from the 135i's N54 cars. I think I saw it posted somewhere that they flow more than the 135i one.

I think it was Harold at HP Auto HP Autosport that said it. I know the primary cats are also different - like you mentioned above, they flow more than the 135i N54 ones.


1M mid pipe w/cats... p/n 18307845669

http://www.realoem.com/bmw/enUS/part...669&series=E82


135i N54 mid pipe w/cats... p/n 18307559994

http://www.realoem.com/bmw/enUS/part...%0918307559994
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      12-04-2015, 09:43 AM   #87
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Quote:
Originally Posted by 1&done
Have a question regarding the secondary cats as I cannot find my answer anywhere, figured this is would be an appropriate place to get the info. ~How restrictive are the secondary cats? I read in some e90posts that the primary are 400 cell and the secondary are 200 cell. I understand the 1M OEM DPs are less restrictive. Not sure about the mid pipe section. It matters as I am tossing around the idea of ordering some HJS 100-200 cell race cats. If the OEM cats are 200s then I will use the OEM mids (fully catlless now) Thnx
Good question. Please post when you find out the answer.
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      12-04-2015, 01:35 PM   #88
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Will do, and thnx for the response Dackel
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