Rear Diffuser Options With Good Fitment

Yadadameans · 09-02-2020, 07:44 PM

So I recently tracked my car on a very hot day (112 degrees F) and melted the rear diffuser. The inner rivets melted so I'm not able to use those anymore. So I cheaped out and bought a cf diffuser from ebay and it didnt fit well. It was filmsy and I couldn't get it to line up properly. Decided to spend more and got AutoTeknic difffuser and didnt fit well as I would like either. The middle clips doesnt seem to sit well. Are all these diffusers bad fitment? Is it my installation error? Could my melted diffuser cause all these other ones not fit well? Is M performance diffuser the one that fits the best? Anyone have AutoTeknic diffuser? Need some options and opinions.

Top is AutoTeknic
Bottom is ebay

Wei718 · 09-02-2020, 09:01 PM

Where in the bay are you? If you're in the east bay (Hayward area) you can swing by my place and we can take a look at it and compare to mine. I have the original M Performance diffuser.

Yadadameans · 09-03-2020, 03:23 AM

Quote:

Originally Posted by Wei718

Where in the bay are you? If you're in the east bay (Hayward area) you can swing by my place and we can take a look at it and compare to mine. I have the original M Performance diffuser.

I'll pm you. Thanks

M2OG · 09-08-2020, 07:05 PM

Rkp and M performance both fit really well. It's a roll of the dice with lesser vendors. Even copy to copy

SM2 · 09-09-2020, 06:53 PM

I've heard M performance is a pain to install.

DriverDaily · 09-09-2020, 10:31 PM

I would ask my dealer I'd they would put the cost of an OEM replacement under warranty towards an OEM carbon fiber one.

Wei718 · 09-09-2020, 10:39 PM

Quote:

Originally Posted by SM2

I've heard M performance is a pain to install.

The real pain is when trying to remove the OEM diffuser.

Yadadameans · 09-10-2020, 12:51 AM

Quote:

Originally Posted by Wei718

The real pain is when trying to remove the OEM diffuser.

Mine was easy to come off after taking it off like twice lol.
Update on the thread. Wei718 was able to help me get the AutoTechnik diffuser to fit on better. Fitment isn't the best but it's like good enough.

AndrewC1989 · 09-10-2020, 03:36 PM

If perfect fitment and good quality is important to you I'd probably go OEM M performance. Buy it nice or buy it twice, as they say.

DarthFader · 09-11-2020, 03:07 PM

Quote:

Originally Posted by M2OG

Rkp and M performance both fit really well. It's a roll of the dice with lesser vendors. Even copy to copy

Agree with this. My buddy has the RKP and it looks/fits perfect. Nice alternative to the M performance.

DanG · 09-11-2020, 08:27 PM

I have the M Performance. Fits great and easy install. As previously stated, removing the OEM diffuser is the hard part.

m7ammed · 09-12-2020, 11:48 PM

I have the Akrapovic diffuser installed, and it is a perfect fit

https://f87.bimmerpost.com/forums/sh....php?t=1755172

papibigred · 09-28-2020, 09:35 PM

Late to the party, but can anyone describe the difference between the RKP and M Performance? I'm squinting at pictures, but that's not going to help me at this point.

M2OG · 09-28-2020, 10:16 PM

Quote:

Originally Posted by papibigred

Late to the party, but can anyone describe the difference between the RKP and M Performance? I'm squinting at pictures, but that's not going to help me at this point.

The fins on the RKP are slightly longer(hang lower) vs the M performance part.

RocketBoots · 09-28-2020, 10:53 PM

I have the RKP. Fit is perfect, same as OEM. Quality is same as well. I preferred the slightly more aggressive fins.

papibigred · 09-29-2020, 05:18 AM

Quote:

Originally Posted by M2OG

The fins on the RKP are slightly longer(hang lower) vs the M performance part.

That's what I sensed but couldn't piece it together in my head!

Quote:

Originally Posted by RocketBoots

I have the RKP. Fit is perfect, same as OEM. Quality is same as well. I preferred the slightly more aggressive fins.

I'm a fan of the RKP work. Subtle but with a little more presence.

stulio2181 · 10-14-2020, 10:37 AM

MP diffuser for me. The fit is perfect and I think it's one of the better looking diffusers on the market.

3t3p · 10-14-2020, 03:21 PM

Bought M perf used off eBay. Yeh it had minor ding or two that got can't realistically see from normal viewing distances.

Too many stories of people disappointed by third party fitment issues. Also looks OEM.

bngcruiser · 10-14-2020, 03:57 PM

Anyone given Spin Monsters a go? Their P1 Diffuser with the F1 light looks sweet.

mikewills · 10-14-2020, 09:58 PM

I second the RKP diffuser for style and figment. If you want something closer to the MP, but slightly better fin design, then RKP is it. Of course, looks are subjective.

09-02-2020, 07:44 PM	#1
Yadadameans Private First Class 158 Rep 130 Posts Drives: F87 M2 Competition Join Date: Mar 2019 Location: Bay Area, CA iTrader: (0)	Rear Diffuser Options With Good Fitment So I recently tracked my car on a very hot day (112 degrees F) and melted the rear diffuser. The inner rivets melted so I'm not able to use those anymore. So I cheaped out and bought a cf diffuser from ebay and it didnt fit well. It was filmsy and I couldn't get it to line up properly. Decided to spend more and got AutoTeknic difffuser and didnt fit well as I would like either. The middle clips doesnt seem to sit well. Are all these diffusers bad fitment? Is it my installation error? Could my melted diffuser cause all these other ones not fit well? Is M performance diffuser the one that fits the best? Anyone have AutoTeknic diffuser? Need some options and opinions. Top is AutoTeknic Bottom is ebay Last edited by Yadadameans; 09-02-2020 at 08:31 PM..
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09-02-2020, 09:01 PM	#2
Wei718 Major 340 Rep 1,089 Posts Drives: 718 GT4 Join Date: Nov 2012 Location: Hayward iTrader: (9)	Where in the bay are you? If you're in the east bay (Hayward area) you can swing by my place and we can take a look at it and compare to mine. I have the original M Performance diffuser.
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09-08-2020, 07:05 PM	#4
M2OG Lieutenant 400 Rep 463 Posts Drives: a car Join Date: Jun 2014 Location: California iTrader: (1)	Rkp and M performance both fit really well. It's a roll of the dice with lesser vendors. Even copy to copy
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09-09-2020, 06:53 PM	#5
SM2 Major 732 Rep 1,312 Posts Drives: 2015 Audi S6 \| 2017 BMW M2 \| 2 Join Date: Apr 2014 Location: WI iTrader: (0)	I've heard M performance is a pain to install.
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09-09-2020, 10:31 PM	#6
DriverDaily Private First Class 226 Rep 198 Posts Drives: M2 Competition Join Date: Sep 2019 Location: Texas iTrader: (5)	I would ask my dealer I'd they would put the cost of an OEM replacement under warranty towards an OEM carbon fiber one.
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09-10-2020, 03:36 PM	#9
AndrewC1989 Brigadier General 10911 Rep 4,541 Posts Drives: 2015 328d xDrive Join Date: Aug 2010 Location: NoVA iTrader: (5) Garage List 2015 328d xDrive [8.75]	If perfect fitment and good quality is important to you I'd probably go OEM M performance. Buy it nice or buy it twice, as they say.
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09-11-2020, 08:27 PM	#11
DanG Major General 10583 Rep 6,918 Posts Drives: 2018 M2 AW DCT Join Date: Aug 2012 Location: Seattle, WA iTrader: (1) Garage List 2018 BMW M2 [7.68]	I have the M Performance. Fits great and easy install. As previously stated, removing the OEM diffuser is the hard part.
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09-12-2020, 11:48 PM	#12
m7ammed Captain 210 Rep 959 Posts Drives: 2019 M2 Competition Join Date: Nov 2008 Location: Saudi Arabia iTrader: (0)	I have the Akrapovic diffuser installed, and it is a perfect fit https://f87.bimmerpost.com/forums/sh....php?t=1755172 __________________ Instgram: @m7m_photo
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09-28-2020, 09:35 PM	#13
papibigred Private 85 Rep 77 Posts Drives: ‘21 BMW, M2C; ‘18 Join Date: Jul 2020 Location: CT iTrader: (0)	Late to the party, but can anyone describe the difference between the RKP and M Performance? I'm squinting at pictures, but that's not going to help me at this point.
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09-28-2020, 10:53 PM	#15
RocketBoots Colonel 1860 Rep 2,104 Posts Drives: Horse Drawn Carriage Join Date: Jan 2014 Location: Bay Area iTrader: (3)	I have the RKP. Fit is perfect, same as OEM. Quality is same as well. I preferred the slightly more aggressive fins.
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10-14-2020, 10:37 AM	#17
stulio2181 Second Lieutenant 376 Rep 236 Posts Drives: 2018 LBB M2 Join Date: Dec 2014 Location: Austin,TX iTrader: (0)	MP diffuser for me. The fit is perfect and I think it's one of the better looking diffusers on the market.
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10-14-2020, 03:21 PM	#18
3t3p Major 455 Rep 1,389 Posts Drives: M2 Join Date: May 2018 Location: NZ iTrader: (0)	Bought M perf used off eBay. Yeh it had minor ding or two that got can't realistically see from normal viewing distances. Too many stories of people disappointed by third party fitment issues. Also looks OEM. Last edited by 3t3p; 10-24-2020 at 04:35 PM..
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10-14-2020, 03:57 PM	#19
bngcruiser Second Lieutenant 277 Rep 266 Posts Drives: '89 Land Cruiser, '18 M2 Join Date: Mar 2020 Location: Denver, CO iTrader: (0) Garage List 2018 BMW M2 [0.00]	Anyone given Spin Monsters a go? Their P1 Diffuser with the F1 light looks sweet.
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10-14-2020, 09:58 PM	#20
mikewills Captain 66 Rep 971 Posts Drives: Ducati Hypermotard Join Date: Jul 2011 Location: DMV iTrader: (2) Garage List 2008 Duc 848 [0.00]	I second the RKP diffuser for style and figment. If you want something closer to the MP, but slightly better fin design, then RKP is it. Of course, looks are subjective.
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