N51 n52 difference

E46driver · 01-20-2013, 12:55 AM

I want to buy a used active autowerke exhaust. the post indicates that it was for an n51 and i have an n52 will the exhaust fit fine?

cuiter23 · 01-20-2013, 04:15 AM

Its designed to fit your car.

Delusive · 01-20-2013, 05:41 AM

N51 is the SULEV edition, they changed some stuff in the engine so it saves a little more gas than the N52 I guess, other than that the exhaust should fit and work for you.

manutdas11 · 01-20-2013, 01:01 PM

It will fit perfectly fine.

Wrngway · 01-20-2013, 04:58 PM

The exhaust should fit an N52 as intended with no issues. Check the emissions sticker under your hood. If it says SULEV then you have an N51. ULEV is N52.

I assumed I had an n52 till I checked. If you haven't looked, you really should. I was a bit surprised.

On N51's the pipe after the resonator is a larger diameter than the N52 cars and I needed to have it welded on. For N51 cars, a couple inches will need to be cut off of the AA exhaust so that it'll weld up properly.

I have some pictures on a review thread I posted a few months back if you're curious.

Rival · 01-21-2013, 08:48 AM

n51 has 3stg intake manifold. n52 has higher compression. minor minor differences.

91nctdi · 01-23-2013, 07:37 PM

Both of engine is reliability?

E46driver · 02-04-2013, 08:40 PM

Wait a second a n51 has a 3 stage manifold?

SDemetris · 02-04-2013, 08:42 PM

Quote:

Originally Posted by E46driver

Wait a second a n51 has a 3 stage manifold?

yupp

E46driver · 02-04-2013, 08:44 PM

Then doesn't that mean the n51 cars come from the factory with more power overall?

SDemetris · 02-04-2013, 09:19 PM

Quote:

Originally Posted by E46driver

Then doesn't that mean the n51 cars come from the factory with more power overall?

no. the compression ratio of the n51 is lower.. not by much, just a little. I am pretty sure the n51 also has an extra set of cats. someone can correct me if i'm wrong, but i think those are the two biggest differences

b-man · 10-22-2013, 07:42 PM

Quote:

Originally Posted by SDemetris

no. the compression ratio of the n51 is lower.. not by much, just a little. I am pretty sure the n51 also has an extra set of cats. someone can correct me if i'm wrong, but i think those are the two biggest differences

I didn't know about the extra set of cats, interesting.

Teeeg28 · 10-27-2013, 11:25 AM

I have an N51. From all my knowledge gained from reading about the 3 stage and such, if you get a AA stage 2 tune done on a n51 it's close to the power of a 330. Just as if a N52 got a 3 stage and then got the tune. I could be wrong but that's what I was told by many people. Currently on my n51 performance wise I have PE, PI and AA Stage 2 and loving it.

jc5988 · 10-27-2013, 06:21 PM

Quote:

Originally Posted by baris

I didn't know about the extra set of cats, interesting.

Quote:

Originally Posted by SDemetris

no. the compression ratio of the n51 is lower.. not by much, just a little. I am pretty sure the n51 also has an extra set of cats. someone can correct me if i'm wrong, but i think those are the two biggest differences

both US N52 N51 came with secondary cats, but N51 unit are more denser.

01-20-2013, 12:55 AM	#1
E46driver Captain 78 Rep 739 Posts Drives: 2009 E92 N51 328i Join Date: Jan 2012 Location: Rowland Heights iTrader: (4)	N51 n52 difference I want to buy a used active autowerke exhaust. the post indicates that it was for an n51 and i have an n52 will the exhaust fit fine?
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01-20-2013, 04:15 AM	#2
cuiter23 Major 81 Rep 1,094 Posts Drives: 2023 G87 M2 6Spd Join Date: Jul 2012 Location: Canada iTrader: (1) Garage List 2007 BMW 328i [6.00]	Its designed to fit your car. __________________ [SOLD] 2007 E90 328i - Titanium Metallic l 19" VMR V710 l H&R Trak+ Spacers l M-Sport Rear Bumper l Mtech Rear Lip Spoiler l Hamann Front Lip l Eibach Sportline l AA N52 Signature Exhaust l OEM Blacklines l MTEC V3 AE l 6000K HID l Nokya 7000K Fogs l MTEC License Plate LED l Interior LED l 15% Tint l BlackVue DR380G-HD + PMP 2023 G87 M2 6Spd - HEA Package \| OEM M Performance Carbon Wing
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01-20-2013, 05:41 AM	#3
Delusive Lieutenant Colonel 136 Rep 1,598 Posts Drives: Bagged E92 Join Date: May 2012 Location: Bay Area, CA iTrader: (9)	N51 is the SULEV edition, they changed some stuff in the engine so it saves a little more gas than the N52 I guess, other than that the exhaust should fit and work for you. __________________ Instagram Youtube
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01-20-2013, 01:01 PM	#4
manutdas11 EL JIMMY NEURON 44 Rep 1,180 Posts Drives: Jet Black E90 Join Date: Aug 2012 Location: in the Napa Valley/SJ... iTrader: (0)	It will fit perfectly fine. __________________ 2007 Jet Black E90 328i Thread: http://www.e90post.com/forums/showthread.php?t=825249 Instagram: manutd_as
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01-20-2013, 04:58 PM	#5
Wrngway Lieutenant 31 Rep 393 Posts Drives: '11 328i Sedan A6 Join Date: Jul 2011 Location: D.C. Metro iTrader: (1)	The exhaust should fit an N52 as intended with no issues. Check the emissions sticker under your hood. If it says SULEV then you have an N51. ULEV is N52. I assumed I had an n52 till I checked. If you haven't looked, you really should. I was a bit surprised. On N51's the pipe after the resonator is a larger diameter than the N52 cars and I needed to have it welded on. For N51 cars, a couple inches will need to be cut off of the AA exhaust so that it'll weld up properly. I have some pictures on a review thread I posted a few months back if you're curious.
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01-21-2013, 08:48 AM	#6
Rival Captain 66 Rep 790 Posts Drives: 95 z28 Join Date: Jul 2012 Location: shytown iTrader: (0)	n51 has 3stg intake manifold. n52 has higher compression. minor minor differences. __________________ 2010 335i M sport 2008 328i 2006 325i 1995 Z28 6spd - 377rwhp rip
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01-23-2013, 07:37 PM	#7
91nctdi Enlisted Member 2 Rep 47 Posts Drives: Planning get one Join Date: Jan 2013 Location: NC iTrader: (1)	Both of engine is reliability?
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02-04-2013, 08:40 PM	#8
E46driver Captain 78 Rep 739 Posts Drives: 2009 E92 N51 328i Join Date: Jan 2012 Location: Rowland Heights iTrader: (4)	Wait a second a n51 has a 3 stage manifold? __________________ 2009 Alpine White E92 N51 328i Automagic \| Premium & Sport Pkg. \| Coral Red/Black Dakota Leather Interior \| M-Spor \| BMW Performance Exhaust \| Active Autowerke Headers \| BBS CH-R \| CPS Front Lip \| Performance Front Grills \| 888Concepts Custom Headlights (GONE) 2011 Alpine White E90 N55 335i Automagic
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02-04-2013, 08:44 PM	#10
E46driver Captain 78 Rep 739 Posts Drives: 2009 E92 N51 328i Join Date: Jan 2012 Location: Rowland Heights iTrader: (4)	Then doesn't that mean the n51 cars come from the factory with more power overall? __________________ 2009 Alpine White E92 N51 328i Automagic \| Premium & Sport Pkg. \| Coral Red/Black Dakota Leather Interior \| M-Spor \| BMW Performance Exhaust \| Active Autowerke Headers \| BBS CH-R \| CPS Front Lip \| Performance Front Grills \| 888Concepts Custom Headlights (GONE) 2011 Alpine White E90 N55 335i Automagic
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10-27-2013, 11:25 AM	#13
Teeeg28 Banned 48 Rep 519 Posts Drives: E90 "328i" N51 Join Date: Jun 2011 Location: San Diego a.k.a. A Whales Vagina // Cal State San Marcos iTrader: (0)	I have an N51. From all my knowledge gained from reading about the 3 stage and such, if you get a AA stage 2 tune done on a n51 it's close to the power of a 330. Just as if a N52 got a 3 stage and then got the tune. I could be wrong but that's what I was told by many people. Currently on my n51 performance wise I have PE, PI and AA Stage 2 and loving it.
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