[mapleridge]

Originally Posted by CombatNinja

Sure you can use downpipes, right after you execute an N54 swap.

This piece is just a fix for N54 guys running catless downpipes. It tricks the system into thinking everything is normal with the oxygen sensors. Should work on our cars but consult BMS. I know the same concept won't work on the N55 for some reason.

FWIW, I predict 12whp peak and +20whp above 6000rpm once these are on the dyno.

Djapex and another member are running the fix and it works for them.

[Johnny D]

I thought djapex simply had his rear o2 sensors unplugged...?

[Johnny D]

I thought djapex simply had his rear o2 sensors unplugged...?

[mapleridge]

Originally Posted by Johnny D

I thought djapex simply had his rear o2 sensors unplugged...?

you might be right. I remember in his thread he said he was going to buy the downpipe fix after another member said he was using it with success. I will have to check again. then again djapex had another issue that was causing his car to run rich. I don't know if he actually pulled the code from his car.

[mapleridge]

Originally Posted by BudVlad

It looks like the OEM manifold without cats will be more efficient:

How did you come to this conclusion?

[Johnny D]

Originally Posted by mapleridge

How did you come to this conclusion?

I ignored his comment because he has the n53 euro motor and this doesnt apply to the US spec cars. Also, if he wants to ship me a set of the n53 manifolds Ill pay shipping, cut the cats out and do a dyno comparison.

[Amini77]

How do these compare to obx?

[Johnny D]

Originally Posted by Amini77

How do these compare to obx?

I already answered the same question the first time you asked. You get what you pay for...

OBX requires you to cut a chunk out of the motor mount and the welds aren't that great of a quality.

If you're unable to afford a set of proper headers, your best option is to cut out the cats on the OEM manifolds and weld in pipe in its place.

[BudVlad]

Originally Posted by mapleridge

How did you come to this conclusion?

Shape of the pipes. (Later version N52 has the same manifold as N53).

[BudVlad]

Originally Posted by Johnny D

I ignored his comment because he has the n53 euro motor and this doesnt apply to the US spec cars. Also, if he wants to ship me a set of the n53 manifolds Ill pay shipping, cut the cats out and do a dyno comparison.

Later version of N52 has the same manifold as N53. There was a thread by someone who is racing 328i and he is using OEM catless manifold.

BTW: the OEM manifold picture is from Penske parts catalog (N52).

[Johnny D]

Originally Posted by BudVlad

Later version of N52 has the same manifold as N53. There was a thread by someone who is racing 328i and he is using OEM catless manifold.

BTW: the OEM manifold picture is from Penske parts catalog (N52).

I remember the thread, but I cant find it. What I did find was a 328i race car using supersprint headers.

You're going to have to show me the matching part numbers...Im not finding it. The pic you used is a generic one from BMW. Check realoem and you'll see it is reused on every n51/2/3 diagram euro or us spec...even on my 9/05 325i which I know doesnt have that manifold.

euro 325i n53
http://realoem.com/bmw/showparts.do?...41&hg=18&fg=10

us spec cars
325i
http://realoem.com/bmw/showparts.do?...87&hg=18&fg=10

330i
http://realoem.com/bmw/showparts.do?...87&hg=18&fg=10

328i (I see the part number change, but dont see any difference while googling it.)
http://realoem.com/bmw/showparts.do?...18&fg=10&hl=26

Even Penske parts reuses the image...
http://www.penskeparts.com/DiagramsB...%0A18407597868

[Amini77]

Originally Posted by Johnny D

I already answered the same question the first time you asked. You get what you pay for...

OBX requires you to cut a chunk out of the motor mount and the welds aren't that great of a quality.

If you're unable to afford a set of proper headers, your best option is to cut out the cats on the OEM manifolds and weld in pipe in its place.

lol i commented on the wrong topic i had another tab open sorry about that but thanks for the extra info

[mapleridge]

Originally Posted by BudVlad

Later version of N52 has the same manifold as N53. There was a thread by someone who is racing 328i and he is using OEM catless manifold.

BTW: the OEM manifold picture is from Penske parts catalog (N52).

I remember that thread too. I could never find it again either. All the manifolds I have seen have the same collector as the one on the right.



I have not seen a north american car with collectors like the one on the left in the pic. Anywhoo. No one has dyno'd these mmw headers yet. I don't think I have seen a dyno of supersprint before either. All I have seen is dimsums dyno of the primary delete with 15whp gain. I just bought a stock manifold and it is en route to me from NY. Once I get it I will delete the cats and dyno. I already have a baseline so I think it will be a good reference.


Johnny,

Your headers look mig welded, are they?

[DJ Apex]

Originally Posted by mapleridge

you might be right. I remember in his thread he said he was going to buy the downpipe fix after another member said he was using it with success. I will have to check again. then again djapex had another issue that was causing his car to run rich. I don't know if he actually pulled the code from his car.

ya my issues was my exhaust manfold gaskits were bad for cylinder's 2 3 4 so it was throwing off both o2's i tried the burger motorsports o2 fix and it helped but didnt cure the issues i think it was casue i had my car reflashed two weeks after that and it turned off my rear o2s anyways but i kept throwing codes for them to find out it was the o2 fix that was messing things up so i unplugged them and bam im all good lol

[mapleridge]

Originally Posted by DJ Apex

ya my issues was my exhaust manfold gaskits were bad for cylinder's 2 3 4 so it was throwing off both o2's i tried the burger motorsports o2 fix and it helped but didnt cure the issues i think it was casue i had my car reflashed two weeks after that and it turned off my rear o2s anyways but i kept throwing codes for them to find out it was the o2 fix that was messing things up so i unplugged them and bam im all good lol

Thanks for clarifying. so you unplugged your sensors or the downpipe fix?

[DJ Apex]

Originally Posted by mapleridge

Thanks for clarifying. so you unplugged your sensors or the downpipe fix?

both since they are both one in the same now

[Johnny D]

Originally Posted by DJ Apex

both since they are both one in the same now

Did you cap off the hole or leave the sensor in the manifold?

[mapleridge]

Originally Posted by DJ Apex

both since they are both one in the same now

Basically you are saying that the flash worked to remove the CEL. Your problem with CEL was due to the gasket leak. Fair enough. I thought the AA flash for the sensors didn't work this whole time.

[andrey_gta]

Originally Posted by BudVlad

Later version of N52 has the same manifold as N53.

I doubt this is true, Some one needs to take a peek at a dealership of 2012 128i or smth.(I did, but I forgot what I saw. :S)

My 2008 128i has the flat simple manifold

[Tim M]

Can't wait to get mine.

[BudVlad]

Originally Posted by BudVlad

Later version N52 has the same manifold as N53.

Maybe not. My friend from Halifax, NS has 2012 128i and he told me that he has the same exhaust manifold as on my N53.

[just4kickz]

where r dem dynos