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Old 06-17-2016, 11:06 PM   #1
evanr614
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M tech 2 brake duct confusion

I've gone through numbers of threads and I hate to beat a dead horse but I cant find any conclusive info for my specific application.

I finally buckled down and bought what I thought were the proper brake ducts for my replica m tech 2 front bumper. Im going to have the bumper off for an electric fan swap anyways.

After I got the ducts I realized there is no bracket to mount them and I believe I bought the wrong ones, for the non ZHP 330 bumper. Part numbers 51717896407 and 51717893130.

I attached a photo off all the different part numbers here. I'm assuming I need the two that say M by them...but there are multiple ones... And I will just be replacing the "front duct" as well now.
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Old 06-17-2016, 11:09 PM   #2
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The brake ducts are easy. The older E46s used a 2-piece design, the newer ones a 1-piece design, and in countries where the E46 had no brake duct, a bracket in place of the brake duct is used because it also holds the plastic undertray and lower fender liner.
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Old 06-17-2016, 11:11 PM   #3
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gotcha, well as i showed in the pictures there are many different part numbers for the ducts and I have no way of telling which ones are the correct ones.
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Old 06-17-2016, 11:14 PM   #4
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http://www.realoem.com/bmw/enUS/show...diagId=51_3275

In that link 16 & 24 is the 2-piece design, 4 is the one piece design and 19 is the pseudo brake duct.
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Old 06-17-2016, 11:19 PM   #5
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51717896407 and 51717896408 are the correct part numbers. I have a used set I'm going to put up for sale if I don't hear back from an interested party soon. Here is what they look like. They are upside down in this picture though, rotate them 180 degrees for the correct orientation.

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Old 06-17-2016, 11:37 PM   #6
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Quote:
Originally Posted by cvx5832 View Post
http://www.realoem.com/bmw/enUS/show...diagId=51_3275

In that link 16 & 24 is the 2-piece design, 4 is the one piece design and 19 is the pseudo brake duct.

So the m tech 2 has one piece design. Because I couldn't find part numbers for the brackets anywhere

Quote:
Originally Posted by C00KIE M0NSTER View Post
51717896407 and 51717896408 are the correct part numbers. I have a used set I'm going to put up for sale if I don't hear back from an interested party soon. Here is what they look like. They are upside down in this picture though, rotate them 180 degrees for the correct orientation.


Let me know....and so do those slide into the side of the front duct? confused how they are mounted i guess
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Old 06-18-2016, 12:13 AM   #7
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Originally Posted by evanr614 View Post
Let me know....and so do those slide into the side of the front duct? confused how they are mounted i guess


The orange line is the front bumper. The blue arrows show where the bolts go in at the top of the duct to mount to the car. The red arrows show where the screws go in from the plastic splash shield after the ducts have been mounted. Let me know if that all makes sense..
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Old 06-18-2016, 12:16 AM   #8
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Quote:
Originally Posted by C00KIE M0NSTER View Post

The orange line is the front bumper. The blue arrows show where the bolts go in at the top of the duct to mount to the car. The red arrows show where the screws go in from the plastic splash shield after the ducts have been mounted. Let me know if that all makes sense..
totally got it now. check your pms
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Old 10-09-2016, 02:42 PM   #9
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Quote:
Originally Posted by cvx5832 View Post
http://www.realoem.com/bmw/enUS/show...diagId=51_3275

In that link 16 & 24 is the 2-piece design, 4 is the one piece design and 19 is the pseudo brake duct.
When you say older bmws have 2 piece and newer have 1 piece -- do you mean older = preface and newer = facelift?
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