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      04-18-2016, 04:09 PM   #1
Ryan@IND
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IND | F87 M2 BMW M Performance Rear Diffuser DIY

BMW F87 M2 M Performance Diffuser DIY

Tools Needed:

8mm Socket
Extension
Ratchet
Pry tool for push rivets

Step 1:
Remove the two 8mm screws on each end. These will be reused with the new diffuser.

Step 2:
Remove the six pop rivets using a pry tool. These will be reused with the new diffuser.

Step 3:
Start on either the right or left side by pulling on the diffuser to release the tabs. The ends come out with ease whereas the center section will need a good amount of force to release the tabs that hold it in place.

Step 4:
Press the M performance diffuser in. On our car we found that the ends clip in place easily, but the center took some effort to ensure the clips engaged. I found that pressing on the inside of the bumper while pressing from the diffuser simultaneously made it easier.

Step 5:
Press the six pop rivets back into place.

Step 6:
Screw the two 8mm back into place.



















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      04-18-2016, 09:59 PM   #2
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Strange, I have a screw just above the tips on both side you can't reach without removing the exhaust. At least it felt that way, have to take a second look now.

Good job with all the DIY!
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      04-19-2016, 10:16 AM   #3
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Quote:
Originally Posted by metrickid View Post
Strange, I have a screw just above the tips on both side you can't reach without removing the exhaust. At least it felt that way, have to take a second look now.

Good job with all the DIY!
Luckily you do not need to remove those torx screws above the tips. These hold a heatshield onto the stock diffuser which is not used on the M performance diffuser
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      04-19-2016, 01:45 PM   #4
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Quote:
Originally Posted by Ryan@IND View Post
Luckily you do not need to remove those torx screws above the tips. These hold a heatshield onto the stock diffuser which is not used on the M performance diffuser
Ah, great! I put of the installation just because I saw them.

Thanks a ton!
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      04-24-2016, 12:06 PM   #5
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Did you just pull it straight out? Slowly pull or quick pull?

Tried to remove it today and the sides were no problem at all but the center ones were impossible, pulled as hard as I dared but all that happens was my rear bumper flexing.
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      04-25-2016, 06:49 AM   #6
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Excellent write up! It only leaves us with one question. The BMW manual for this upgrade states that a software upgrade is required after fitting the new diffuser.

Any thoughts on this? Is it really required yes or no? Felt any difference while driving with the new diffusor.

MR
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      08-27-2016, 10:07 PM   #7
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Please need some feed-back from "skilled-ish" people like me ;-P
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      09-24-2016, 02:07 PM   #8
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Any updates on this?

Has anyone figured out a better way to deal with the center tabs? I do not want to break the factory piece, but I'm more worried about damaging the carbon fiber tabs that are a lot more delicate.
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      09-24-2016, 05:22 PM   #9
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Quote:
Originally Posted by fun2drv
Has anyone figured out a better way to deal with the center tabs? I do not want to break the factory piece, but I'm more worried about damaging the carbon fiber tabs that are a lot more delicate.
Take off screws on rear panel on middle underneath car and then you can easily slide your hand in and unlatch it. I took of stock diffuser without removing stock exhaust. Took me about thirty minutes first time trying it.
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      11-13-2016, 07:10 AM   #10
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Shit this not easy!!!!!
There is 2 pices of plastic which will not be re-used.
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      11-27-2016, 12:35 AM   #11
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10 outa 10 hard. Very real moments where I questioned if this was even possible. Taking out the 4 center screws that hold on part of the exhaust heat shield is the only way. No idea how the guy above me did this in 30 mins.
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      12-09-2016, 03:51 AM   #12
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Where's the official instructions for fitting this please?
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      12-10-2016, 11:54 AM   #13
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Quote:
Originally Posted by M2wolf View Post
Where's the official instructions for fitting this please?
This is the best you can get !!!
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      12-10-2016, 11:56 PM   #14
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Quote:
Originally Posted by Glounk View Post
This is the best you can get !!!
It's true. It's very straight forward and if everything went smooth you could probably get it done in 20 mins. Buuuuut, plan on 3 hours lol
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      01-21-2017, 03:23 PM   #15
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I also had a tough time with the center clips. Opening the heat shield in the middle seemed to help some, but in the end, I think pulling harder is what did the trick. The clips seem to have a self tightening effect which prevented me from pushing them out from the back. There are also small perferations in the bumper cover that it felt like I ripped slightly. so be careful around those areas. you can see them in the IND pics above.

Fitment was pretty good on mine, except the driver side seems like its off by 2mm. not sure if user error on my part, or what? have to get really close to see the issue though. over all it looks great.

Can someone confirm that the two circled pieces in the attached photo are not necessary with the M Performance diffuser?

thanks.
Attached Images
 
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      01-21-2017, 07:11 PM   #16
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Quote:
Originally Posted by lukewayne View Post
I also had a tough time with the center clips. Opening the heat shield in the middle seemed to help some, but in the end, I think pulling harder is what did the trick. The clips seem to have a self tightening effect which prevented me from pushing them out from the back. There are also small perferations in the bumper cover that it felt like I ripped slightly. so be careful around those areas. you can see them in the IND pics above.

Fitment was pretty good on mine, except the driver side seems like its off by 2mm. not sure if user error on my part, or what? have to get really close to see the issue though. over all it looks great.

Can someone confirm that the two circled pieces in the attached photo are not necessary with the M Performance diffuser?

thanks.
Confirmed that those parts aren't needed. As for the 2mm part. I know what you're talking about... one at a time I went to each clip and made sure it was in as far as it could go. After doing that everything lined up perfect. Congrats on surviving the nightmare center clips!
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      01-31-2017, 07:33 AM   #17
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Thanks for the guide and pictures.
Unfortunately you haven't adequately described the releasing of the 4 middle clips on the original diffuser. What a "son of a gun" !
Still worth all the effort....carbon looks great.
Thanks again
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      02-01-2017, 03:46 PM   #18
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I did this to my car a few weeks back. I found using the flat round end of a plastic trim tool to push against the 4 centre clips helped release them. I though it was harder to fit the CF diffuser
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      02-01-2017, 06:39 PM   #19
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I ended up getting a sweet deal from my dealer that was cheaper than any place that I could buy the part from. It took the dealer technician over an hour to do the installation and had to go get a second one to help him out...

Not sure what BMW did to the design. I did the one on my 135i with NO issues and the one in the M4 with no issues either.
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      03-13-2017, 02:30 AM   #20
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I removed the 4 center tabs by first removing the bottom screws from the inside middle part of the heat shield, inserting my hand through inside diffuser and using a flat heat screwdriver to push the 4 center clips down, while pulling the diffuser away from the outside. These 4 center tabs were near impossible to take out. There is absolutely no way to take it off by simply pulling from the outside without breaking anything.
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      03-14-2017, 12:15 AM   #21
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      03-19-2017, 10:47 AM   #22
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I just bought a used one but none of the tabs would clip onto the bumper. Not even the corner tabs. Anybody else having this issue? It seems like the tabs aren't long enough. The previous owner told me only BMW tech can do the install.
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