Originally Posted by Nezil
I'm starting the process of preparing to do this mod, and have gathered all of the parts I need from the various locations including this thread, the one linked previously, and a guy in South Korea on the F30 forum that retrofitted his 4 series. I also went through each relevant section of RealOEM for the M4, M2C and OG M2 and compared parts from each section for duplicates, and then went through the removal and installation procedure in ISTA+ for the torque settings and replacement requirements.
I thought it might be worth sharing this full parts list on here because there are some parts which aren't needed for the M2, and some which are different between the M4 and M2C. To aid in copy and pasting, I'm going to use fixed width font to create a table (and what a bitch that was to get everything lined up; forum software doesn't let you use more than 1 space at a time!) because a table would end up as an image and couldn't be copied from.
I'm fairly confident that this is correct, but feel free to comment if I've missed anything or made any mistakes. I can always go back and edit the post if need be.
The first point of confusion is that the M2 has 5 M8 bolt strut towers, and early M3 and M4 models had 3 M10 bolt towers. This results in different reinforcing rings, strut top hats and strut braces.
The next point of confusion is right and left hand drive. Many of the forum posts were from UK based owners and their part numbers are sometimes different. I'm actually British myself (shout out to my homies!), but am based in the US, so all of the parts listed here are for an OG US M2; LCI in my case, but I don't think that makes a difference.
So without further ado, here is the list:
Description | BMW Description | Part Number | Qty Needed | Notes
- Strut Reinforcement - (Optional, and not on M2C)
Strut reinforcement | Reinforcement for support bearing, left | 31302361991 | 1 |
Strut reinforcement | Reinforcement for support bearing, right | 31302361992 | 1 |
Longer screws for reinforcement plate | Hex screw (M8X33 10.9 ZNS3) | 31307855400 | 10 | Renew 30Nm + 90 Degrees
- Aluminum Strut Brace -
Aluminum strut brace | Strut brace | 31127855855 | 1 |
Aluminum brace to strut top bolt | Torx screw with collar (ASA M8X30) | 31106859809 | 10 | 28Nm (May only need 6)
Aluminum brace to fender top bolt | Torx screw with collar (M10X30-PC-10.9) | 33326796225 | 2 | 34Nm
Aluminum brace to bulkhead bolt | Hex bolt with washer (M10X25-10.9) | 31106854219 | 2 | Renew 56Nm + 90 Degrees
Rivnut for top of fender | Blind rivet nut, flat headed (M10) | 51718065070 | 2 |
2 additional listed for M2C & M4 | Filister-head Screw (M8 X 18) | 07147327937 | 2 | (May not be needed)
Strut top hat for M2C brace | Guide support | 31307853702 | 2 |
Strut top nut | Nut, self-locking (M14X1,5-05 ZNS3 | 34339806226 | 2 | Renew 71Nm
- Carbon CFRP Brace -
CFRP U shaped brace | Strut, CFRP, front end | 51618061631 | 1 |
CFRP to aluminum brace bolt | Hex bolt with washer (M8X32-ZNS3) | 11287839136 | 6 | Renew 28Nm
CFRP brace to front | Hex bolt with washer (M8X22-8.8-ZNS3) | 22326760945 | 2 | Renew 28Nm
- Plastic Trim -
Rubber strut top cover | Left engine hood sealing | 51768066661 | 1 |
Rubber strut top cover | Right engine hood sealing | 51768066662 | 1 |
Top of fender to hood plastic | Sealing side panel, left | 51768073533 | 1 |
Top of fender to hood plastic | Sealing side panel, right | 51768073534 | 1 |
Under window plastic cowl | Cowl panel cover, Part 1 | 51718073545 | 1 |
Right bulkead cover | Cowl panel cover, Part 2 | 51718059699 | 1 |
Left bulkhead cover | Cover for units compartment | 64318059697 | 1 |
- To return to stock -
Strut brace to strut top | Torx screw with collar (ASA M10X20) | 07147270121 | 2 | Renew 56Nm + 90 Degrees
Strut brace to bulkhead bolt | Hex bolt with washer (M10X25-10.9) | 31106854219 | 2 | Renew 56Nm + 90 Degrees
Strut top nut | Nut, self-locking (M14X1,5-05 ZNS3 | 34339806226 | 2 | Renew 71Nm
Shorter screws w/o reinforcement | Hex screws (M8X30-10.9) | 31306869931 | 10 | Renew 30Nm + 90 Degrees
One thing to note if you choose not to do the reinforcement, or if you choose to do reinforcement separately and before you do the Aluminum strut brace, is that the top hat securing bolts and shock top nut are single use, and you'll need to replace these each time you change the suspension top hat.
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