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Replacing Exhaust Manifold
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09-10-2013, 09:29 PM | #1 |
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Replacing Exhaust Manifold
I just recently swapped out my N51 for a N52, everything went fine, except now I also need to change out my exhaust manifold because its clogged. The part I'm replacing is 18407563738 . I was able to get one from Magnaflow for $750. I would like to know if its necessary that I remove the entire exhaust just to replace the manifold? I was able to remove the hex nut(7) from the the bottom of the manifold piping. Shouldn't I be able to just unscrew the nuts holding the header in place and pull the manifold up from the top of the car?
I'm also having issues getting the hex screw out of the the collar, Im not sure if I'm supposed hammer it out or what. The head of the screw looks rounds. It is definitely rusted. I had to use pb blaster just to unscrew the nut of the bolt. |
09-10-2013, 11:26 PM | #2 |
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Pics of the Magnaflow part - i made a post about it last year ago
Idea is that maganflow will flow better than original OEM, maybe because it is new. People install headers without removign exhaust, you shoudl be okay, follow any e82 or 9x header isntall diy. There is one diy with Superprint headers All manifolds are pulled from under the car.... not from top. I hope you find tips on how to get those stubborn bolts.
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09-11-2013, 10:09 AM | #4 | |
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On a side note, while comparing n51 to n52 pics, I noticed the lack of a emission control air-pump. In fact, on the n52, the port for the valve(8) is covered when I had my n52 installed, they kept the emission control air-pump. My question is, do I need it? If not, can I remove it without having any errors thrown? |
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09-11-2013, 03:06 PM | #5 | |
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Active Autowerke Stage II | MMW CSv2 Exhaust | MMW Catless Headers | BC Racing BR Extreme Low Coilovers | custom adjustable rear suspension links | 19" Hyperblack CSL's | M3 style front | trim wrapped in brushed steel vinyl | Slightly smoked tail lights with clear reverse lights | factory xenons |
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09-11-2013, 03:17 PM | #6 |
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Also to answer your question about whether or not you can remove an exhaust manifold without removing the exhaust, I'd recommend that you go ahead and pull it off the car. I failed miserably when I tried to knock the bolts out of the flanges on the manifolds, and I had them off the car when I tried to do that. I think the problem is that the exhaust manifolds see such drastic temperature changes that they eventually become very hard to remove. The exhaust takes maybe 5 minutes to drop, and 10 to hang.
Also be sure that you change the ring gaskets on the manifold so you don't end up with an exhaust leak at the head. You can also replace the studs and copper hex nuts if you'd like, but when I installed my race headers I had no issues with reusing them... And they've been on and off the car a total of probably 5 times now.
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Active Autowerke Stage II | MMW CSv2 Exhaust | MMW Catless Headers | BC Racing BR Extreme Low Coilovers | custom adjustable rear suspension links | 19" Hyperblack CSL's | M3 style front | trim wrapped in brushed steel vinyl | Slightly smoked tail lights with clear reverse lights | factory xenons |
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09-12-2013, 04:37 PM | #7 | |
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09-14-2013, 12:32 PM | #8 | |
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09-14-2013, 01:00 PM | #9 |
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Sorry to hear about that. It looks like some extreme bends and the piping doesn't look equal length. I am not sure what your mechanic is saying about it hitting the frame. I don't think that is possible. It may be hitting the transmission housing. I believe that is a strong possibility. I am sure Magnaflow would return it if that is the case but unfortunately, that doesn't solve your problem.
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09-14-2013, 03:07 PM | #10 | |
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09-14-2013, 04:49 PM | #11 | |
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Do your research and message me if you need a set. I know you are in a bind. I can do 3 day shipping and in most cases get it out next day. |
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