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BMW 5-Series (G30) Forum Cosmetic Modifications M5 rear diffuser

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      02-25-2020, 05:46 PM   #23
brokeboi
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Quote:
Originally Posted by r33_RGSport View Post
That is an aftermarket M5 style.
It is not 1:1 to the real M5 one.
That's why it fit.

I have tested the real one for F90 M5 to G30, the exhaust tip doesn't line up since the F90 M5 is more toward the center.
Also you will need to cut or get the F90 M5 Trunk Kick sensors bracket.
That's interesting. I am about to do a custom exhaust on a 530e by doing a muffler delete and adding quad exhaust tips. I already have an M5 style diffuser from ebay, but I originally wanted to get the OEM version.
I don't have trunk kick sensors on my car, so would the OEM F90 M5 diffuser fit perfectly? Do I have to make any other modifications other than the ones that you mentioned, or is it pretty much "plug&play" if I'm doing custom exhaust + no trunk kick sensor?
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      02-26-2020, 06:39 AM   #24
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Originally Posted by MoeMo87 View Post
Thanks for your response!

I was thinking of replacing the m550 rear bumper with the stock M5's so that I wouldn't have any trouble trouble with the rear diffuser fitment. But this also requires some of the plastic cover shields under the exhaust to be changed because of the layout of the M5 bumper.

As you mentioned, the only other thing I need to figure out at this time is how the exhaust fitment would work.

I was hoping if I went with a aftermarket exhaust such as Dinan, it would help resolve that issue.

I attached 2 pics, one for the M550 and the other for M5 with Dinan exhaust. Seems like it could be possible

When you tested it out, was it with the stock M550 exhaust? What are your thoughts on fitment with a Dinan exhaust?
I believe I have figured out how to make this work, but custom exhaust will be needed for correct line up. You will however be free to use any exhaust that would fit on a stock M5.

It should be possible to get the stock M5 diffuser to fit, but you will need the F90 exhaust support (Product number 51-12-8-065-846) in order to make the cutouts from the diffuser to line up correctly. Otherwise you will end up exposing parts of the G30 exhaust support through the M5 diffuser, the reason being, as r33_RGSport mentioned, that the M5 exhausts are more towards the center.

Part 1, 5 and 6 on the F90 are identical to the G30. Part 3 (exhaust support), 4 and 19 are what you need for this modification. The whole rear panel might have to be removed to install the exhaust support.

I've seen someone from Turkey and Korea using OEM M5 parts on a G30. The guy from Turkey spent over 30k USD on the conversion from a 520i, the only thing missing being the M5 engine and seats.
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      02-26-2020, 08:22 AM   #25
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Quote:
Originally Posted by brokeboi View Post
Quote:
Originally Posted by MoeMo87 View Post
Thanks for your response!

I was thinking of replacing the m550 rear bumper with the stock M5's so that I wouldn't have any trouble trouble with the rear diffuser fitment. But this also requires some of the plastic cover shields under the exhaust to be changed because of the layout of the M5 bumper.

As you mentioned, the only other thing I need to figure out at this time is how the exhaust fitment would work.

I was hoping if I went with a aftermarket exhaust such as Dinan, it would help resolve that issue.

I attached 2 pics, one for the M550 and the other for M5 with Dinan exhaust. Seems like it could be possible

When you tested it out, was it with the stock M550 exhaust? What are your thoughts on fitment with a Dinan exhaust?
I believe I have figured out how to make this work, but custom exhaust will be needed for correct line up. You will however be free to use any exhaust that would fit on a stock M5.

It should be possible to get the stock M5 diffuser to fit, but you will need the F90 exhaust support (Product number 51-12-8-065-846) in order to make the cutouts from the diffuser to line up correctly. Otherwise you will end up exposing parts of the G30 exhaust support through the M5 diffuser, the reason being, as r33_RGSport mentioned, that the M5 exhausts are more towards the center.

Part 1, 5 and 6 on the F90 are identical to the G30. Part 3 (exhaust support), 4 and 19 are what you need for this modification. The whole rear panel might have to be removed to install the exhaust support.

I've seen someone from Turkey and Korea using OEM M5 parts on a G30. The guy from Turkey spent over 30k USD on the conversion from a 520i, the only thing missing being the M5 engine and seats.
Yeah I had all the parts in place.
Biggest issue was the exhaust.
I have Dinan and it wasn't clearing the diffuser. We needed to start doing custom work on the exhaust, also changing where the hangers were sitting etc... so I just said forget it. It was taking to much time and the cost kept going up.
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      02-26-2020, 08:24 AM   #26
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Quote:
Originally Posted by brokeboi View Post
Quote:
Originally Posted by MoeMo87 View Post
Thanks for your response!

I was thinking of replacing the m550 rear bumper with the stock M5's so that I wouldn't have any trouble trouble with the rear diffuser fitment. But this also requires some of the plastic cover shields under the exhaust to be changed because of the layout of the M5 bumper.

As you mentioned, the only other thing I need to figure out at this time is how the exhaust fitment would work.

I was hoping if I went with a aftermarket exhaust such as Dinan, it would help resolve that issue.

I attached 2 pics, one for the M550 and the other for M5 with Dinan exhaust. Seems like it could be possible

When you tested it out, was it with the stock M550 exhaust? What are your thoughts on fitment with a Dinan exhaust?
I believe I have figured out how to make this work, but custom exhaust will be needed for correct line up. You will however be free to use any exhaust that would fit on a stock M5.

It should be possible to get the stock M5 diffuser to fit, but you will need the F90 exhaust support (Product number 51-12-8-065-846) in order to make the cutouts from the diffuser to line up correctly. Otherwise you will end up exposing parts of the G30 exhaust support through the M5 diffuser, the reason being, as r33_RGSport mentioned, that the M5 exhausts are more towards the center.

Part 1, 5 and 6 on the F90 are identical to the G30. Part 3 (exhaust support), 4 and 19 are what you need for this modification. The whole rear panel might have to be removed to install the exhaust support.

I've seen someone from Turkey and Korea using OEM M5 parts on a G30. The guy from Turkey spent over 30k USD on the conversion from a 520i, the only thing missing being the M5 engine and seats.
On the other hand, this diffuser I went with didn't turn out so bad.
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Last edited by MoeMo87; 02-26-2020 at 08:52 AM..
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      02-26-2020, 09:05 AM   #27
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Quote:
Originally Posted by MoeMo87 View Post
On the other hand, this diffuser I went with didn't turn out so bad.
That looks good.

I'm doing a M5 M Performance style diffuser next week, will post pictures when it's finished.
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      02-26-2020, 09:09 AM   #28
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Quote:
Originally Posted by MoeMo87 View Post
Yeah I had all the parts in place.
Biggest issue was the exhaust.
I have Dinan and it wasn't clearing the diffuser. We needed to start doing custom work on the exhaust, also changing where the hangers were sitting etc... so I just said forget it. It was taking to much time and the cost kept going up.
Dinan is probably the most challenging exhaust to fit, as the tailpipes are huge. Anything else will probably clear the diffuser. Did you figure out how the exhaust support is mounted, and did you have to remove the entire rear panel?

Did you end up returning the parts to the dealer? My dealer doesn't take returns, so I have to be 100% sure that it will work if I were to do this in the future.
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      02-27-2020, 09:48 AM   #29
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Blank

It wasn't aligning up right to the diffuser opening on one side. This was even before the tips for the exhaust were attached.

The hangers for the exhaust definitely had to be relocated if I wanted to go through with the m5 diffuser. We did take of the rear panel.

Yeah the shop I was working with ended up returning the parts. We never went through with it because all of the custom work that was required, so I'm not 100 percent sure on fitment for those parts but we didn't see any reason why they wouldn't fit.

I'm surprised your dealership doesn't accept returns on parts
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      02-28-2020, 03:45 AM   #30
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Quote:
Originally Posted by MoeMo87 View Post
It wasn't aligning up right to the diffuser opening on one side. This was even before the tips for the exhaust were attached.

The hangers for the exhaust definitely had to be relocated if I wanted to go through with the m5 diffuser. We did take of the rear panel.

Yeah the shop I was working with ended up returning the parts. We never went through with it because all of the custom work that was required, so I'm not 100 percent sure on fitment for those parts but we didn't see any reason why they wouldn't fit.

I'm surprised your dealership doesn't accept returns on parts
Sounds like a whole lot of headache. I'll probably just stick with the M5 M Performance style diffuser that I already got.
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      02-28-2020, 08:15 AM   #31
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Installed the diffuser today, along with quad exhaust.
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      02-29-2020, 01:32 AM   #32
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Quote:
Originally Posted by brokeboi View Post
Installed the diffuser today, along with quad exhaust.
Looks really nice!
Did you get a custom exhaust?
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      02-29-2020, 03:38 PM   #33
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Quote:
Originally Posted by MoeMo87 View Post
Looks really nice!
Did you get a custom exhaust?
Yes, I removed the muffler and added a Y-Pipe. The car is really loud now.
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      02-29-2020, 03:54 PM   #34
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Quote:
Originally Posted by brokeboi View Post
Quote:
Originally Posted by MoeMo87 View Post
Looks really nice!
Did you get a custom exhaust?
Yes, I removed the muffler and added a Y-Pipe. The car is really loud now.
That's awesome, enjoy it
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      03-02-2020, 11:44 AM   #35
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Quote:
Originally Posted by MoeMo87 View Post
On the other hand, this diffuser I went with didn't turn out so bad.
Is that spoiler the RW Carbon Performance spoiler or is it the BMW MP Pro Spoiler? They seem to be identical apart from the 50% difference in price.
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      03-02-2020, 11:54 AM   #36
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Quote:
Originally Posted by brokeboi View Post
Quote:
Originally Posted by MoeMo87 View Post
On the other hand, this diffuser I went with didn't turn out so bad.
Is that spoiler the RW Carbon Performance spoiler or is it the BMW MP Pro Spoiler? They seem to be identical apart from the 50% difference in price.
Mine is the MP pro.
Which RW carbon spoiler style is identical?
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      03-02-2020, 03:45 PM   #37
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Quote:
Originally Posted by MoeMo87 View Post
Mine is the MP pro.
Which RW carbon spoiler style is identical?
This one
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      03-02-2020, 03:54 PM   #38
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Quote:
Originally Posted by brokeboi View Post
Quote:
Originally Posted by MoeMo87 View Post
Mine is the MP pro.
Which RW carbon spoiler style is identical?
This one:
https://www.********.com/196/9/0/115...k-spoiler.html
This link you sent does not work. But I did google it and your correct, pretty much looks identical.

So I have the carbon fiber MP pro rear spoiler and the RW carbon fiber rear diffuser, the weave pattern are almost identical between both also.

RW seems to be a good option at half the cost
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      03-02-2020, 06:09 PM   #39
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Quote:
Originally Posted by MoeMo87 View Post
RW seems to be a good option at half the cost
Agreed on the initial install. I am interesting in on your thoughts 6 months down the road...Any yellowing of the CF occurring?
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      03-02-2020, 06:59 PM   #40
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Quote:
Originally Posted by Dobie Dog View Post
Quote:
Originally Posted by MoeMo87 View Post
RW seems to be a good option at half the cost
Agreed on the initial install. I am interesting in on your thoughts 6 months down the road...Any yellowing of the CF occurring?
The one I have on my rear spoiler is OEM, I haven't noticed any changes at all. Still looks brand new

With that being said, I haven't heard of any complaints from consumers or forum members on RW Carbon products for discoloration.

However if that is the case, I would not think twice about spending the extra money for the OEM part.

I installed a carbon fiber rear diffuser on my car from RW last week, so it's pretty much new now. But I will keep an eye out on it to see if I'm noticing changes over time.

I felt like my car was missing some aggressiveness in the back. I was looking for an OEM rear diffuser in this style but couldn't find anything so I pulled the trigger on the one from RW
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