2019: Current e90 Sedan Rear Diffuser Options

noremaC · 02-15-2019, 07:42 AM

There is a sparse offering to say the least. There are extremely low cost (eBay), mid-range (JL motoring) and hyper-premium (3D Design, RKP/Challenge etc.) carbon fiber diffuser options for the sedan today.

Are there any cost-effective options that I've missed that are at a decent price point, with decent fitment and finish? I know some have had luck with eBay and others, not so much. I would tend to say "fitment" and "quality" is still subjective.

It's a long shot and will probably have to shell out upwards for $1k for a decent quality piece however I don't want to leave no stone unturned.

Cheers!

Camnyc · 02-15-2019, 08:36 AM

Id like to know as well

s14_kev · 02-15-2019, 10:54 AM

I would add Vorsteiner and Arkym to the mix. They are similar in price to RKP/Challenge.

The 3D Design is in a class of its own as it is double the price of the above options.

noremaC · 02-15-2019, 10:58 AM

Quote:

Originally Posted by kevin///mlee

I would add Vorsteiner and Arkym to the mix. They are similar in price to RKP/Challenge.

The 3D Design is in a class of its own as it is double the price of the above options.

Good point. My underlying hope is that someone has found a vendor on eBay (or somewhere) that has a legitimate option for that lower end price ($300-ish). Doubtful but I've got to inquire.

s14_kev · 02-15-2019, 11:02 AM

Quote:

Originally Posted by noremaC

Good point. My underlying hope is that someone has found a vendor on eBay (or somewhere) that has a legitimate option for that lower end price ($300-ish). Doubtful but I've got to inquire.

FWIW, I bought an authentic Vorsteiner piece on this forum for an ungodly low price. They are rare but deals can pop up from time to time. It was on my last M3 and I sold it when I sold the car. Now that I bought another E90, I'm on the hunt again too and wish I held on to the diffuser

noremaC · 02-15-2019, 11:16 AM

Quote:

Originally Posted by kevin///mlee

FWIW, I bought an authentic Vorsteiner piece on this forum for an ungodly low price. They are rare but deals can pop up from time to time. It was on my last M3 and I sold it when I sold the car. Now that I bought another E90, I'm on the hunt again too and wish I held on to the diffuser

Been going down this path for a month...no luck so far.

s14_kev · 02-15-2019, 12:23 PM

Quote:

Originally Posted by noremaC

Been going down this path for a month...no luck so far.

I just saw your WTB thread, can you post some pics of how the E92 tips sit without the diffuser? TIA

noremaC · 02-15-2019, 01:29 PM

Quote:

Originally Posted by kevin///mlee

Quote:

Originally Posted by noremaC

Been going down this path for a month...no luck so far.

I just saw your WTB thread, can you post some pics of how the E92 tips sit without the diffuser? TIA

Cyba Tips, e92 length. Car hasn't been started today so this is cold. Definitely get longer when hot.

shimmy23 · 02-15-2019, 05:28 PM

I really wish there was a metak diffuser for the e90

BayE30 · 02-15-2019, 05:59 PM

Quote:

Originally Posted by shimmy23

I really wish there was a metak diffuser for the e90

+1.

Jhanksm3 · 02-15-2019, 06:08 PM

Im looking as well OP

Conzyo · 02-15-2019, 06:25 PM

Look for ebay diffusers, anything else is just overpriced over lays.

noremaC · 02-15-2019, 06:31 PM

Quote:

Originally Posted by Conzyo

Look for ebay diffusers, anything else is just overpriced over lays.

Haven't found a design I like on eBay. There's also some real shitty ones (fitment). I feel like it's luck of the draw on that factor. Also, a lot of the diffusers out there have tiny fins. RKP race diffuser is by far my favorite because of that design. Decisions, decisions. $1k on a tiny carbon fiber piece is preposterous.

Conzyo · 02-15-2019, 09:09 PM

Quote:

Originally Posted by noremaC

Quote:

Originally Posted by Conzyo

Look for ebay diffusers, anything else is just overpriced over lays.

Haven't found a design I like on eBay. There's also some real shitty ones (fitment). I feel like it's luck of the draw on that factor. Also, a lot of the diffusers out there have tiny fins. RKP race diffuser is by far my favorite because of that design. Decisions, decisions. $1k on a tiny carbon fiber piece is preposterous.

Yeah $1k for a small piece diffuser is crazy, but if it's real carbon then it's worth it. JL motoring have some nice ones

E90M3velocity · 02-15-2019, 10:10 PM

Glad I'm not the only one in this position, but there is also the FancyWide diffuser if you want more of an aggressive look. I feel you need to go with that racy look to pull it off though. Went with that look in my last car, I'm over it. I'm just trying to stay with the understated aggression that BMW gave to this and past M's. I like the RKP one, not sure I want to spend 1k at the moment. Then again it's not like its going to get damage like an expensive front lip getting scraped.

Camnyc · 02-15-2019, 11:03 PM

how many of us want the rkp one? maybe IND can do a group buy?

noremaC · 02-16-2019, 09:40 AM

Quote:

Originally Posted by Camnyc

how many of us want the rkp one? maybe IND can do a group buy?

Good call. If they can get the cost down, I'd be interested. IMO, it's the best looking diffuser currently available.

Quote:

Originally Posted by E90M3velocity

Glad I'm not the only one in this position, but there is also the FancyWide diffuser if you want more of an aggressive look. I feel you need to go with that racy look to pull it off though. Went with that look in my last car, I'm over it. I'm just trying to stay with the understated aggression that BMW gave to this and past M's. I like the RKP one, not sure I want to spend 1k at the moment. Then again it's not like its going to get damage like an expensive front lip getting scraped.

Yup. Way too aggressive for what I'm going for. TBH, looking for a diffuser that will hide the "length" of my e92/coupe length tips + add a little aggression and contrast.

E90M3velocity · 02-16-2019, 07:02 PM

I'm surprised there isn't any replicas of the RKP one. Darn this M tax, 1k for a small diffuser is hard to justify compared to a mod like an autosolutions ssk that you will appreciate more out of

amrazM · 02-17-2019, 05:47 PM

Quote:

Originally Posted by E90M3velocity

I'm surprised there isn't any replicas of the RKP one. Darn this M tax, 1k for a small diffuser is hard to justify compared to a mod like an autosolutions ssk that you will appreciate more out of

Word, not paying 1k for a little piece of cfrp that will just get burnt from my exhaust. I am Running the fancywide lower diffuser in the back and I’m fine with it.

derbo · 02-20-2019, 01:46 PM

Quote:

Originally Posted by E90M3velocity

I'm surprised there isn't any replicas of the RKP one. Darn this M tax, 1k for a small diffuser is hard to justify compared to a mod like an autosolutions ssk that you will appreciate more out of

I second the AS ssk instead

The BMW CF trunk spoiler is like $350 and that a factory fitment piece.

The closest one I like is the JL-Motoring Type II CF diffuser is the closest to the Challenge/RKP ones with an extra line in the middle for $450.

s14_kev · 02-21-2019, 12:02 AM

Quote:

Originally Posted by derbo

Quote:

Originally Posted by E90M3velocity

I'm surprised there isn't any replicas of the RKP one. Darn this M tax, 1k for a small diffuser is hard to justify compared to a mod like an autosolutions ssk that you will appreciate more out of

I second the AS ssk instead

The BMW CF trunk spoiler is like $350 and that a factory fitment piece.

The closest one I like is the JL-Motoring Type II CF diffuser is the closest to the Challenge/RKP ones with an extra line in the middle for $450.

That's a direct replica of the Vorsteiner Type II. The unique part about Challenge/RKP is that the fins are about 50% "deeper" than all of the other options and currently nobody makes a rep of it.

Yoko22R · 02-21-2019, 12:17 AM

I put a Fancywide over a Challenge diffuser. You could probably keep it under $1k with a Challenge rep and the Fancywide.

02-15-2019, 07:42 AM	#1
noremaC . 242 Rep 714 Posts Drives: e90M Join Date: Sep 2014 Location: Charlotte, NC iTrader: (3)	2019: Current e90 Sedan Rear Diffuser Options There is a sparse offering to say the least. There are extremely low cost (eBay), mid-range (JL motoring) and hyper-premium (3D Design, RKP/Challenge etc.) carbon fiber diffuser options for the sedan today. Are there any cost-effective options that I've missed that are at a decent price point, with decent fitment and finish? I know some have had luck with eBay and others, not so much. I would tend to say "fitment" and "quality" is still subjective. It's a long shot and will probably have to shell out upwards for $1k for a decent quality piece however I don't want to leave no stone unturned. Cheers! __________________ Current: 2009 Alpine White/Black e90 m3 Past: 2008 Interlagos/Black e92 m3
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02-15-2019, 08:36 AM	#2
Camnyc wannabe 252 Rep 819 Posts Drives: E90 LCI M3 Join Date: Dec 2012 Location: nyc iTrader: (3)	Id like to know as well __________________ E90 M3 - 6speed - slicktop - single hump
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02-15-2019, 10:54 AM	#3
s14_kev Major 367 Rep 1,036 Posts Drives: E90 M3, E30 M3 Join Date: Sep 2012 Location: Bay Area, CA iTrader: (21)	I would add Vorsteiner and Arkym to the mix. They are similar in price to RKP/Challenge. The 3D Design is in a class of its own as it is double the price of the above options. __________________ Akrapovic \| AngeliBright \| APEX \| Hankook \| IND \| JRZ RS1 \| Macht Schnell \| Mode Carbon \| Vorsteiner
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02-15-2019, 05:28 PM	#9
shimmy23 F15 daddymobile 2341 Rep 3,507 Posts Drives: GS X5 Join Date: Aug 2011 Location: WA iTrader: (3)	I really wish there was a metak diffuser for the e90 __________________ -brandon F15 Glacier Silver journal
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02-15-2019, 06:08 PM	#11
Jhanksm3 Captain 230 Rep 620 Posts Drives: 2023 G80 M3 Comp Join Date: Mar 2011 Location: Charleston SC via Raleigh NC iTrader: (2)	Im looking as well OP
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02-15-2019, 06:25 PM	#12
Conzyo Pho is yummy 766 Rep 938 Posts Drives: E90 M3 & E70 X5M & 12' GTR Join Date: Jun 2012 Location: MN iTrader: (8)	Look for ebay diffusers, anything else is just overpriced over lays. __________________ 2008 \| 6 SPD \| Fox Red \| Forgestars \| B&G Springs \| M Performance Exhaust \| Catless X pipe \| Alpine Tune
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02-15-2019, 10:10 PM	#15
E90M3velocity Captain 338 Rep 923 Posts Drives: Manual-Slicktop E90 M3 Join Date: Oct 2012 Location: Bay Area CA iTrader: (4)	Glad I'm not the only one in this position, but there is also the FancyWide diffuser if you want more of an aggressive look. I feel you need to go with that racy look to pull it off though. Went with that look in my last car, I'm over it. I'm just trying to stay with the understated aggression that BMW gave to this and past M's. I like the RKP one, not sure I want to spend 1k at the moment. Then again it's not like its going to get damage like an expensive front lip getting scraped.
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02-15-2019, 11:03 PM	#16
Camnyc wannabe 252 Rep 819 Posts Drives: E90 LCI M3 Join Date: Dec 2012 Location: nyc iTrader: (3)	how many of us want the rkp one? maybe IND can do a group buy? __________________ E90 M3 - 6speed - slicktop - single hump
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02-16-2019, 07:02 PM	#18
E90M3velocity Captain 338 Rep 923 Posts Drives: Manual-Slicktop E90 M3 Join Date: Oct 2012 Location: Bay Area CA iTrader: (4)	I'm surprised there isn't any replicas of the RKP one. Darn this M tax, 1k for a small diffuser is hard to justify compared to a mod like an autosolutions ssk that you will appreciate more out of
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02-21-2019, 12:17 AM	#22
Yoko22R Second Lieutenant 184 Rep 258 Posts Drives: E90 M3 Join Date: Jun 2011 Location: Irvine, CA iTrader: (2) Garage List 2008 BMW M3 [0.00]	I put a Fancywide over a Challenge diffuser. You could probably keep it under $1k with a Challenge rep and the Fancywide. Attached Images
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