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      01-20-2013, 01:55 AM   #1
E46driver
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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
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      01-20-2013, 06:41 AM   #3
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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.
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      01-20-2013, 02:01 PM   #4
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It will fit perfectly fine.
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      01-20-2013, 05:58 PM   #5
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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, 09:48 AM   #6
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n51 has 3stg intake manifold. n52 has higher compression. minor minor differences.
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      01-23-2013, 08:37 PM   #7
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Both of engine is reliability?
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      02-04-2013, 09:40 PM   #8
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Wait a second a n51 has a 3 stage manifold?
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      02-04-2013, 09:42 PM   #9
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Quote:
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Wait a second a n51 has a 3 stage manifold?
yupp
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      02-04-2013, 09:44 PM   #10
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Then doesn't that mean the n51 cars come from the factory with more power overall?
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      02-04-2013, 10:19 PM   #11
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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
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      10-22-2013, 07:42 PM   #12
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Quote:
Originally Posted by SDemetris View Post
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.
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      10-27-2013, 11:25 AM   #13
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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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      10-27-2013, 06:21 PM   #14
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Quote:
Originally Posted by baris View Post
I didn't know about the extra set of cats, interesting.
Quote:
Originally Posted by SDemetris View Post
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.
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