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BMW 5-Series (G30) Forum Cosmetic Modifications 540 Gloss black diffuser installed

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      10-31-2018, 04:33 PM   #1
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540 Gloss black diffuser installed

Here is a picture of my '18 540 M-Sport with a gloss black diffuser.

I believe it is M-Performance carbon fibre styled, but in gloss black. Got it from ebay because I can't justify paying three times the price for OEM equivalent.

Fitment is 9/10, very impressed.

Finish overall is very good, 8/10 because there are some rough patches of paint on the underside of the diffuser, we'll see how the gloss black finish withstands harsh Canadian winters.

Poor quality pics in my garage, will take better pics of my car once the rain ceases.



Installation is pretty straight forward, undo the 8mm screws at each bottom corner of the OEM diffuser, undo the 5 or so 8mm screws in the middle of the underside and then yank it out. The clips holding it in place will let go, start from the bottom left corner and work your way to the right side.

To install the new diffuser you just have to get it to clip into place and put the screws back in. If you have a hard time, try bending the clips up a little it'll make it easier for them to catch on to the bumper.

Feel free if you have any questions !
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      11-01-2018, 12:10 PM   #2
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Glad you got it done.
Wasn't that hard, was it?
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      11-01-2018, 06:47 PM   #3
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Quote:
Originally Posted by r33_RGSport View Post
Glad you got it done.
Wasn't that hard, was it?
LOL no wasn't that hard at all, just a much snugger fitment than on my F30 !
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      11-01-2018, 09:24 PM   #4
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Quote:
Originally Posted by 2blu View Post
Here is a picture of my '18 540 M-Sport with a gloss black diffuser.

I believe it is M-Performance carbon fibre styled, but in gloss black. Got it from ebay because I can't justify paying three times the price for OEM equivalent.
Love it!

If you don't mind sharing, what did you pay?
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      11-01-2018, 11:00 PM   #5
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Quote:
Originally Posted by Cougar85 View Post
Love it!

If you don't mind sharing, what did you pay?
Around 300$ CAD if memory serves me right !
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      11-03-2018, 12:42 AM   #6
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link where purchased.

would this fit an M550?
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      11-03-2018, 11:24 AM   #7
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Quote:
Originally Posted by TselaG30 View Post
link where purchased.

would this fit an M550?
https://www.ebay.ca/itm/Glossy-Black-Rear-Diffuser-For-2017-18-BMW-G30-530i-540i-M550i-W-M-Sport-Bumper-/192629463859?txnId=1560212931009

I’m no expert but according to the description it does.
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      11-03-2018, 11:51 AM   #8
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Quote:
Originally Posted by 2blu View Post
Around 300$ CAD if memory serves me right !
Nice! Thanks...
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      11-03-2018, 11:52 AM   #9
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Quote:
Originally Posted by TselaG30 View Post
would this fit an M550?
OP has a 540 M-Sport which has the same rear end as an M550.

So, yes.
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      11-03-2018, 12:25 PM   #10
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Quote:
Originally Posted by Cougar85 View Post
OP has a 540 M-Sport which has the same rear end as an M550.

So, yes.
Although I may have read somewhere that the exhaust tips are different sizes on the 550 and 540, but it seems to me there is enough clearance to fit an exhaust tip that is a tad larger.
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      11-03-2018, 12:35 PM   #11
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Quote:
Originally Posted by TselaG30 View Post
link where purchased.

would this fit an M550?
Quote:
Originally Posted by 2blu View Post
Quote:
Originally Posted by TselaG30 View Post
link where purchased.

would this fit an M550?
https://www.ebay.ca/itm/Glossy-Black...=1560212931009

I'm no expert but according to the description it does.
Based on their products picture, all they showing are for 530/540.

I would message them and find out.

M550iX tip is more square than 530/540.
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      11-03-2018, 03:06 PM   #12
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Quote:
Originally Posted by 2blu View Post
Although I may have read somewhere that the exhaust tips are different sizes on the 550 and 540, but it seems to me there is enough clearance to fit an exhaust tip that is a tad larger.
Ah yes! I'll shut up now.
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      11-27-2018, 01:58 PM   #13
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Very nice! Two questions:

Does it interfere with kick-to-open trunk function?

And also, does anyone know if it works with the electric towbar?
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      11-30-2018, 08:59 AM   #14
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Quote:
Originally Posted by BMWFamilyMan View Post
Very nice! Two questions:

Does it interfere with kick-to-open trunk function?

And also, does anyone know if it works with the electric towbar?
Kick to open trunk function is just as finicky with this diffuser as it was with the oem diffuser
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      11-30-2018, 10:58 AM   #15
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The rear diffusers are different on the 540 compared to the m550. The m550 is considered 8 cylinder optics. Dealer had to swap my 540 diffuser out with a m550 when I had the m performance exhaust put on. The cut outs for the tailpipes are shaped differently between the two models.
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      12-11-2018, 08:41 AM   #16
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I will have to take a look at my car cause for the love of God, I can't remember what the stock diffuser looks like. lol. My car is Frozen Arctic Grey and I just always thought that I had a black diffuser to begin with cause nothing in the back stands out dramatically or anything. lol.

But OP this looks great. I love the white/black contrasting look and in fact this was exactly what I was going for in my 540 until I got offered a the individual matte paint option.
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      12-11-2018, 02:19 PM   #17
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Quote:
Originally Posted by ksa View Post
I will have to take a look at my car cause for the love of God, I can't remember what the stock diffuser looks like. lol. My car is Frozen Arctic Grey and I just always thought that I had a black diffuser to begin with cause nothing in the back stands out dramatically or anything. lol.

But OP this looks great. I love the white/black contrasting look and in fact this was exactly what I was going for in my 540 until I got offered a the individual matte paint option.
The OEM diffuser is a dark grey color, can easily be mistaken for black if you aren’t paying attention to it !

Hey if I was offered frozen grey I would have taken that in a heartbeat too !
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      01-01-2019, 08:12 PM   #18
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looks awesome!
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      04-13-2020, 09:58 PM   #19
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Quote:
Originally Posted by 2blu View Post

..... we'll see how the gloss black finish withstands harsh Canadian winters.

I just ordered the same one based on your recommendation. I shoulda asked this first but....how has it withstood your winters?
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      04-18-2020, 07:33 AM   #20
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I was planning to fit the M Performance rear diffuser.

https://shop.bmw.co.uk/INTERSHOP/web...oryDomainName=

Anyone know how difficult these are to fit? Also not sure what colour to paint it as my car is sapphire black but the lower part of my bumper is a glossy grey colour.
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      04-18-2020, 09:55 AM   #21
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Quote:
Originally Posted by 540i View Post
I was planning to fit the M Performance rear diffuser.

https://shop.bmw.co.uk/INTERSHOP/web...oryDomainName=

Anyone know how difficult these are to fit? Also not sure what colour to paint it as my car is sapphire black but the lower part of my bumper is a glossy grey colour.
I've installed the diffuser probably 10 times - ordered some that didn't fit well from ebay, etc. Finally got a perfect one. It's just a few screws on the bottom and then get the plastic pry tool set and just pry out the tabs all around, very easy.
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      04-18-2020, 06:04 PM   #22
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Thanks dlf, I have learned the hard way over the years that it’s worth paying a little extra for parts that fit well. Good to know that the same goes here.


In terms of colour, my car is black with a grey insert, should the diffuser be painted to match to the grey?
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