N51 n52 difference - BMW 3-Series (E90 E92) Forum

E46driver · 01-20-2013, 01:55 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, 05:15 AM

Its designed to fit your car.

JS-NA.E92 · 01-20-2013, 06:41 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, 02:01 PM

It will fit perfectly fine.

Wrngway · 01-20-2013, 05:58 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, 09:48 AM

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

91nctdi · 01-23-2013, 08:37 PM

Both of engine is reliability?

E46driver · 02-04-2013, 09:40 PM

Wait a second a n51 has a 3 stage manifold?

SDemetris · 02-04-2013, 09:42 PM

Quote:

Originally Posted by E46driver

Wait a second a n51 has a 3 stage manifold?

yupp

E46driver · 02-04-2013, 09:44 PM

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

SDemetris · 02-04-2013, 10:19 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

01-20-2013, 01:55 AM	#1
E46driver New Member Drives: 09 e92 328i Join Date: Jan 2012 Location: Rowland heights Posts: 27 iTrader: (0)	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, 05:15 AM	#2
cuiter23 Captain Drives: e90 328i Join Date: Jul 2012 Location: Vancouver Posts: 687 iTrader: (0) Garage List 2007 BMW 328i [3.62]	Its designed to fit your car. __________________ 2007 E90 328i - Titanium Metallic l ZSP l ZCW l Logic7 l PDC l BlackVue DR380G-HD l MTEC License Plate LED l AA N52 Signature Exhaust l MTEC V3 AE l 6000K HID

01-20-2013, 06:41 AM	#3
JS-NA.E92 Major Drives: 07' NA E92 Join Date: May 2012 Location: San Francisco, CA Posts: 1,041 iTrader: (2)	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. __________________

01-20-2013, 02:01 PM	#4
manutdas11 EL JIMMY NEURON Drives: Jet Black E90 Join Date: Aug 2012 Location: in the Napa Valley... Posts: 940 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

01-21-2013, 09:48 AM	#6
Rival Second Lieutenant Drives: 95 z28 Join Date: Jul 2012 Location: shytown Posts: 244 iTrader: (0)	n51 has 3stg intake manifold. n52 has higher compression. minor minor differences. __________________ 2008 328i 6spd 1995 Z28 6spd - 377rwhp rip

01-20-2013, 05:58 PM	#5
Wrngway First Lieutenant Drives: '11 328i Sedan A6 Join Date: Jul 2011 Location: D.C. Metro Posts: 371 iTrader: (0)	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.

01-23-2013, 08:37 PM	#7
91nctdi New Member Drives: Planning get one Join Date: Jan 2013 Location: NC Posts: 14 iTrader: (0)	Both of engine is reliability?

02-04-2013, 09:40 PM	#8
E46driver New Member Drives: 09 e92 328i Join Date: Jan 2012 Location: Rowland heights Posts: 27 iTrader: (0)	Wait a second a n51 has a 3 stage manifold?

02-04-2013, 09:44 PM	#10
E46driver New Member Drives: 09 e92 328i Join Date: Jan 2012 Location: Rowland heights Posts: 27 iTrader: (0)	Then doesn't that mean the n51 cars come from the factory with more power overall?

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