1M Midpipes

HP Autosport · 10-27-2011, 01:14 AM

Quote:

Originally Posted by robertm

What do you have it mated up to just stock muffler? Give some impressions please! Sound, spool-up etc.

Video clip here with Berk Technology midpipe and stock muffler:

http://www.1addicts.com/forums/showt...highlight=berk

Amnizu · 10-27-2011, 01:24 AM

Quote:

Originally Posted by Sal@AUTOcouture

N55 135i OEM on my 1M

Just wondering, do you have a stock axle back and or downpipes? Would you be willing to post a sound clip? I'm interested in doing this mod married either to aftermarket downpipes, or hallowing out the cats on my stock downpipes. I'm trying to keep the noise level low on this car for the wife but don't really want to leave all this easy power on the table.

robertm · 10-27-2011, 08:35 AM

Quote:

Originally Posted by HP Autowerks

Video clip here with Berk Technology midpipe and stock muffler:

http://www.1addicts.com/forums/showt...highlight=berk

Oh dayum that sounds good. I'm wondering if there is any reason to go with the axle back if the midpipes are installed? As I see it there are three potential reasons to make the change. 1) less weight. 2) More/better sound 3) More free flowing.

At this point the weight savings isn't that important to me. The sound of the midpipes alone is more than enough for me. The last item is what I'm curious about. Can you give us a little insight? Will a Burger or Cobb (etc) tuned car make appreciably more power with Berk midpipes and free flowing axle back compared to just midpipes and stock axleback? It seems like there may be a point of diminishing returns.

Papethova · 10-27-2011, 11:33 AM

Im just straight piping from DPs to axleback.. Pipes are ready, waiting for the car

Sal@AUTOcouture · 10-27-2011, 11:36 AM

Quote:

Originally Posted by luial

Sorry for newbie question, but what does it do?

The N55 135i midpipe is a catless version of the N54 midpipe that our cars have. Essentially its a secondary cat delete with a resonator.

Quote:

Originally Posted by Amnizu

Just wondering, do you have a stock axle back and or downpipes? Would you be willing to post a sound clip? I'm interested in doing this mod married either to aftermarket downpipes, or hallowing out the cats on my stock downpipes. I'm trying to keep the noise level low on this car for the wife but don't really want to leave all this easy power on the table.

Yep, everything else is stock. I'll shoot some video and post for you in a bit

HP Autosport · 10-27-2011, 12:07 PM

Quote:

Originally Posted by robertm

Oh dayum that sounds good. I'm wondering if there is any reason to go with the axle back if the midpipes are installed? As I see it there are three potential reasons to make the change. 1) less weight. 2) More/better sound 3) More free flowing.

At this point the weight savings isn't that important to me. The sound of the midpipes alone is more than enough for me. The last item is what I'm curious about. Can you give us a little insight? Will a Burger or Cobb (etc) tuned car make appreciably more power with Berk midpipes and free flowing axle back compared to just midpipes and stock axleback? It seems like there may be a point of diminishing returns.

You are taking out restriction in the exhaust system and more power is made. During the 3 weeks we spent at GIAC we saw gains with the mid pipe, but we didn't take note of it since it is merely to remove some of the restriction and for better sound.

There will be a new 3" mid pipe for the 1M very soon as well!

Sal@AUTOcouture · 10-27-2011, 12:29 PM

Quote:

Originally Posted by HP Autowerks

You are taking out restriction in the exhaust system and more power is made. During the 3 weeks we spent at GIAC we saw gains with the mid pipe, but we didn't take note of it since it is merely to remove some of the restriction and for better sound.

There will be a new 3" mid pipe for the 1M very soon as well!

2.5" taper from Dp's into 3"? or 3" downpipes all the way thru?

Fundahl · 10-27-2011, 01:09 PM

Yeah we'll need a new DP option to work with 3" mids.

SNOOPY11 · 10-27-2011, 02:42 PM

Quote:

Originally Posted by HP Autowerks

You are taking out restriction in the exhaust system and more power is made. During the 3 weeks we spent at GIAC we saw gains with the mid pipe, but we didn't take note of it since it is merely to remove some of the restriction and for better sound.

There will be a new 3" mid pipe for the 1M very soon as well!

Was here!

Rikx1M · 10-27-2011, 03:39 PM

Quote:

Originally Posted by MusclezMarinara

N55 Fit Perfectly !

I have a 135 with N55 motor...and getting a 1M in a couple of weeks. I already thought about robbing from Peter to pay Paul....what real benefit do I gain if I took off the mid pipe from my N55 and put it on my 1M?

Will the 1M mid pipe work seamless with the N55?

Anyone dyno'd their car after the swap? Is it legal in any states?

luial · 10-27-2011, 05:34 PM

Quote:

Originally Posted by Sal@AUTOcouture

The N55 135i midpipe is a catless version of the N54 midpipe that our cars have. Essentially its a secondary cat delete with a resonator.

Thanks for the information Sal!

Just wondering if Euro versions (as mine is) have the same setup as US cars (which benefit from this mod)?

ADVANT123 · 10-27-2011, 08:12 PM

Any sound difference with the N55 mid pipe?

Sal@AUTOcouture · 10-27-2011, 10:25 PM

Quote:

Originally Posted by luial

Thanks for the information Sal!

Just wondering if Euro versions (as mine is) have the same setup as US cars (which benefit from this mod)?

I'm assuming the exhausts are the same. I could be wrong though.

Quote:

Originally Posted by ADVANT123

Any sound difference with the N55 mid pipe?

Yes, the sound is a little louder sans cats.

robertm · 10-28-2011, 08:09 AM

It 'sounds' like the n55 mids will add a bit of sound. The Berks on the other hand add a symphony of turbo charged terror. I am strongly leaning towards the Berks with stock axle back.

HP Autosport · 10-28-2011, 08:39 AM

Quote:

Originally Posted by Fundahl

Yeah we'll need a new DP option to work with 3" mids.

OE or aftermarket DP will both work with the new 3" mid pipe, that is what they are shooting for anyway. It's going to be another modular system where you can buy the mid, the rear section or as a complete system.

Quote:

Originally Posted by ADVANT123

Any sound difference with the N55 mid pipe?

We have tried that too since that idea was kicked around a bit. For stealth it's great, but the gain is sound is minimum when compared to the Berk.

icabod7 · 10-28-2011, 10:06 AM

superchargedman · 02-18-2012, 03:30 PM

how risky would changing the mids to an n55 be for voiding the warranty if we're just swapping the mid out and sticking on an axle back? thanks.

Papethova · 02-18-2012, 03:55 PM

Quote:

Originally Posted by superchargedman

how risky would changing the mids to an n55 be for voiding the warranty if we're just swapping the mid out and sticking on an axle back? thanks.

You wont void warranty... I had straight pipes on my 135 and an aftermarket axleback

Robcut1 · 02-18-2012, 04:06 PM

Had car to dealer without any mention. N55 Mid pipes still have resonator just missing secondary cats which would probably go unnoticed since there is no error code and further forward. If asked, I would tell them that the stock system made a terrible drone.

superchargedman · 02-19-2012, 02:56 AM

Thanks for the input guys!

10-27-2011, 11:33 AM	#26
Papethova Banned 224 Rep 3,094 Posts Drives: '08 135/ '11 1M Join Date: Oct 2007 Location: at Death Valley 127 iTrader: (1)	Im just straight piping from DPs to axleback.. Pipes are ready, waiting for the car
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10-27-2011, 01:09 PM	#30
Fundahl Captain 8 Rep 704 Posts Drives: VO 1M, 300zx TT Join Date: Mar 2011 Location: Corpus Christi, Texas iTrader: (0)	Yeah we'll need a new DP option to work with 3" mids.
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10-27-2011, 08:12 PM	#34
ADVANT123 Second Lieutenant 15 Rep 298 Posts Drives: 2018 M3 ZCP Join Date: Jul 2009 Location: NJ iTrader: (1)	Any sound difference with the N55 mid pipe? __________________ 2018 BMW M3 ZCP 1999 BMW Z3 M Coupe Turbo 2017 Ram Rebel 2015 Porsche Cayman S
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10-28-2011, 08:09 AM	#36
robertm Major 450 Rep 1,358 Posts Drives: 2020 M2 Comp Join Date: Oct 2007 Location: dfw iTrader: (0)	It 'sounds' like the n55 mids will add a bit of sound. The Berks on the other hand add a symphony of turbo charged terror. I am strongly leaning towards the Berks with stock axle back. Last edited by robertm; 10-28-2011 at 08:19 AM..
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10-28-2011, 10:06 AM	#38
icabod7 Second Lieutenant 18 Rep 254 Posts Drives: 2008 135i Coupe Join Date: Jun 2011 Location: Dallas iTrader: (0)	<mispost> __________________ cdv delete \| clutch stop \| bmw performance ssk \| meisterschaft gt \| berk mids \| dinan cai \| helix fmic \| m3 subframe bushings, swaybar, front and back suspension bits \| dinan stage 1 suspension \| dinan cf strut brace \|gc camber plates \| dinan oil cooler \| apex ec-7s w/PSSs \| cobb stage 1 + fmic
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02-18-2012, 03:30 PM	#39
superchargedman Captain 68 Rep 939 Posts Drives: The ///Mbulance: 1M AW Join Date: Apr 2010 Location: Canada iTrader: (1)	how risky would changing the mids to an n55 be for voiding the warranty if we're just swapping the mid out and sticking on an axle back? thanks.
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02-18-2012, 04:06 PM	#41
Robcut1 Second Lieutenant 112 Rep 267 Posts Drives: 2016 M4GTS Join Date: Oct 2011 Location: Jupiter, Fl iTrader: (1)	Had car to dealer without any mention. N55 Mid pipes still have resonator just missing secondary cats which would probably go unnoticed since there is no error code and further forward. If asked, I would tell them that the stock system made a terrible drone.
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02-19-2012, 02:56 AM	#42
superchargedman Captain 68 Rep 939 Posts Drives: The ///Mbulance: 1M AW Join Date: Apr 2010 Location: Canada iTrader: (1)	Thanks for the input guys!
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