E92 Performance Diffuser query

HollowmanVIII · 08-01-2018, 09:06 AM

Looking to order one soon, for those who fitted one, do you actually need that extra new under tray piece to be able to fit it?

e28bmw · 08-01-2018, 10:44 AM

You don't need the undertray to fit the diffuser but it probably does help a bit with aerodynamics. Mine is a genuine oem performance diffuser bought about a year ago from BMW (thanks Raj!

) and mine never came with the undertray

HollowmanVIII · 08-01-2018, 11:27 AM

Quote:

Originally Posted by e28bmw

You don't need the undertray to fit the diffuser but it probably does help a bit with aerodynamics. Mine is a genuine oem performance diffuser bought about a year ago from BMW (thanks Raj!

) and mine never came with the undertray

Thanks mate, I'll grab the one that doesn't have the tray, seems to be considerably cheaper as well without the tray.

Phil325i · 08-01-2018, 11:45 AM

I bought a diffuser from SSDD and I was able to cut the existing undertray to fit...

CitizenKane · 08-02-2018, 06:29 AM

Quote:

Originally Posted by e28bmw

You don't need the undertray to fit the diffuser but it probably does help a bit with aerodynamics. Mine is a genuine oem performance diffuser bought about a year ago from BMW (thanks Raj!

) and mine never came with the undertray

I had an OEM one for my e92 and it would only fit when I used the new undertray. This was on a 320d though (single exhaust setup) so maybe it's different for a 335i setup?

e28bmw · 08-02-2018, 06:53 AM

Ah good point. Yes the 335i doesn't have the undertray at all

HollowmanVIII · 08-02-2018, 06:56 AM

Might play it safe then and get the full kit. Mstyle do the diffuser, undertray and painting so that looks a decent option at the moment

RajB · 08-05-2018, 04:50 PM

Yeah I do think it depends on model as to whether the undertray is required but then I fitted one to a members E91 (20d) and that didn't require the undertray piece either.

RajB · 08-05-2018, 04:50 PM

Quote:

Originally Posted by e28bmw

....Mine is a genuine oem performance diffuser bought about a year ago from BMW (thanks Raj!

) and mine never came with the undertray

No worries buddy

08-01-2018, 09:06 AM	#1
HollowmanVIII First Lieutenant 36 Rep 336 Posts Drives: BMW 3 Series E92 Join Date: Sep 2015 Location: Euxton iTrader: (0)	E92 Performance Diffuser query Looking to order one soon, for those who fitted one, do you actually need that extra new under tray piece to be able to fit it?
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08-01-2018, 10:44 AM	#2
e28bmw First Lieutenant 301 Rep 323 Posts Drives: 1987 e28 and 2008 e92 335i msp Join Date: Feb 2017 Location: Wales iTrader: (0)	You don't need the undertray to fit the diffuser but it probably does help a bit with aerodynamics. Mine is a genuine oem performance diffuser bought about a year ago from BMW (thanks Raj! ) and mine never came with the undertray __________________ Instagram @Jay4000
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08-01-2018, 11:45 AM	#4
Phil325i Brigadier General 615 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	I bought a diffuser from SSDD and I was able to cut the existing undertray to fit... __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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08-02-2018, 06:53 AM	#6
e28bmw First Lieutenant 301 Rep 323 Posts Drives: 1987 e28 and 2008 e92 335i msp Join Date: Feb 2017 Location: Wales iTrader: (0)	Ah good point. Yes the 335i doesn't have the undertray at all __________________ Instagram @Jay4000
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08-02-2018, 06:56 AM	#7
HollowmanVIII First Lieutenant 36 Rep 336 Posts Drives: BMW 3 Series E92 Join Date: Sep 2015 Location: Euxton iTrader: (0)	Might play it safe then and get the full kit. Mstyle do the diffuser, undertray and painting so that looks a decent option at the moment
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08-05-2018, 04:50 PM	#8
RajB Brigadier General 448 Rep 3,312 Posts Drives: E92 335i Join Date: Nov 2014 Location: Midlands iTrader: (4)	Yeah I do think it depends on model as to whether the undertray is required but then I fitted one to a members E91 (20d) and that didn't require the undertray piece either. __________________ E92 335i / M3 Hybrid - The Build
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