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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Active Autowerke | N52 Signature Exhaust



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      09-23-2012, 09:30 AM   #287
Wrngway
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Concerning N51 vs N52 exhuast. It's the section after the secondary cats that is different.

After checking on realoem, both engines do have secondary cats. It looks like the muffler & resonator are one part in the N51 (Rear Exhaust PN 18307572671), whereas the N52 they are two seperate parts (Center Muffler PN 18307567138 & Rear Muffler PN 18307566941). Pictures may explain better.

Here's the N52:


N52 Part#'s:
http://realoem.com/bmw/showparts.do?...11&hg=18&fg=20

Here's the N51:


N51 Part#'s:
http://realoem.com/bmw/showparts.do?...87&hg=18&fg=20
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      09-23-2012, 03:15 PM   #288
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Wrngway has been nice enough to let us know that our exhaust will not fit the n51 without being modified due to a larger diameter of the stock piping.

Potential buyers please note:

It will require some cutting and welding.
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      09-25-2012, 03:28 PM   #289
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Dynoed the exhaust today and it made power!
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      09-25-2012, 05:06 PM   #290
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Excellent! Plans on sharing the results?
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      09-25-2012, 06:32 PM   #291
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
Dynoed the exhaust today and it made power!
Anything over zero is great!

I'm sure you'll get bombarded with questions. Did the car have any supporting mods like an AA tune, intake, etc.?
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      09-25-2012, 08:43 PM   #292
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What about the back pressure? It's a muffler delete after all.
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      09-25-2012, 08:56 PM   #293
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Quote:
Originally Posted by BimmerPower View Post
What about the back pressure? It's a muffler delete after all.
The placement of our drone chamber will create some back pressure. Ill take a picture and show you what i'm talking about.

Gaines were seen throughout the entire rpm band except for redline where it matched that of the stock muffler.

Ill post some official results tomorrow but I believe it was 5-6 whp and 7-8 wtq.
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      09-25-2012, 11:54 PM   #294
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Quote:
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I believe it was 5-6 whp and 7-8 wtq.
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      09-26-2012, 02:26 AM   #295
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Quote:
Originally Posted by Andrew@ActiveAutowerke
The placement of our drone chamber will create some back pressure. Ill take a picture and show you what i'm talking about.

Gaines were seen throughout the entire rpm band except for redline where it matched that of the stock muffler.

Ill post some official results tomorrow but I believe it was 5-6 whp and 7-8 wtq.
Woooo! I didn't even expect a gain of power. That's awesome!

Last edited by ZeroSix; 09-26-2012 at 05:57 PM.
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      09-26-2012, 09:43 AM   #296
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
Wrngway has been nice enough to let us know that our exhaust will not fit the n51 without being modified due to a larger diameter of the stock piping.
Is there some kind of adapter that can be fashioned by AA before I get my installer in there cutting and welding?
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      09-26-2012, 10:21 AM   #297
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That's sick! A little bonus on top of the sound. Mine finally made its way to the west coast. Should be picking it up today.
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      09-26-2012, 11:19 AM   #298
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Quote:
Originally Posted by upstatedoc View Post
Is there some kind of adapter that can be fashioned by AA before I get my installer in there cutting and welding?
We were just talking about this. Anyone know the exact diameter of the n51 piping?

We don't have any n51's in this state.
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      09-26-2012, 12:04 PM   #299
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
We were just talking about this. Anyone know the exact diameter of the n51 piping?

We don't have any n51's in this state.
Any chance of AA engineering, developing, manufacturing and sending this out overnight for my install tomorrow?

may have to delay install if you guys are working on something that will facilitate install
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      09-26-2012, 12:17 PM   #300
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Quote:
Originally Posted by upstatedoc View Post
Any chance of AA engineering, developing, manufacturing and sending this out overnight for my install tomorrow?

may have to delay install if you guys are working on something that will facilitate install

Just get it welded! At least that's what I'll do...
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      09-26-2012, 01:37 PM   #301
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Quote:
Originally Posted by upstatedoc View Post
Any chance of AA engineering, developing, manufacturing and sending this out overnight for my install tomorrow?

may have to delay install if you guys are working on something that will facilitate install
Don't have anything in the works at the moment.
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      09-26-2012, 07:39 PM   #302
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Finally got it installed!

Last edited by GermanMuscle; 09-26-2012 at 10:11 PM.
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      09-26-2012, 07:55 PM   #303
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WOoohoo
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      09-26-2012, 09:01 PM   #304
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Finally got it installed!
ZOMG!!! Okay, I am going tomorrow first thing in the morning to get this welded on!!!
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      09-26-2012, 11:24 PM   #305
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Huuuuuuge difference.
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      09-26-2012, 11:38 PM   #306
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Huuuuuuge difference.
and much better
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      09-27-2012, 08:01 AM   #307
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Finally got it installed!
Need some outside driving videos of you pulling away and some drive bys. Great first video tho
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      09-27-2012, 08:44 AM   #308
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That sounds incredible!
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