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      02-21-2017, 01:29 AM   #1
nvschell
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Need help with my diffuser

I bought an m-tech bumper for my 07 335xi. I also purchased a carbon fiber performance diffuser. The diffuser doesn't even come close to fitting. Do I buy a plastic performance diffuser or return the carbon one and try another vendor? Please help, as of now I'm driving around with no diffuser. Thanks in advance.
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      02-21-2017, 01:52 AM   #2
bsmoov
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i have an OEM performance diffuser..

Fits 10000% no gaps and factory mounting points.
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      02-21-2017, 02:45 AM   #3
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2011 BMW 335i  [0.00]
fitment

usually......90% + of the time the Chinese(and other countries) aftermarket parts will not fit or come close to proper fitment with out some modification needed to be done to the bumper and to the part(diffuser in your case) they work on a template or "mold" that is not 100% proper sizing to begin with. everyone I know that has used an aftermarket piece(myself included) had some type of modification done. and if you do, you won't be able to go back to oem fit/stock cause you've modified the bumper. which is not a big deal if you plan on keeping it or adding other CF pieces to your ride. I do recommend you get it done by a professional if you choose to go thru with it. you have to trim off some of the bumper and off the edge of the diffuser. depending how much extra material you have. its not uncommon for this to be done. but if you are not comfortable doing it yourself, get it done by someone who does.


and to clarify....cause I know someone will also chime in or have something to say, some exceptions that a part won't require any modification, they will fit great. but again exceptions. not the case all the time, hence the reason I said 90%+
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      02-21-2017, 12:17 PM   #4
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Quote:
Originally Posted by Socaltrojan View Post
usually......90% + of the time the Chinese(and other countries) aftermarket parts will not fit or come close to proper fitment with out some modification needed to be done to the bumper and to the part(diffuser in your case) they work on a template or "mold" that is not 100% proper sizing to begin with. everyone I know that has used an aftermarket piece(myself included) had some type of modification done. and if you do, you won't be able to go back to oem fit/stock cause you've modified the bumper. which is not a big deal if you plan on keeping it or adding other CF pieces to your ride. I do recommend you get it done by a professional if you choose to go thru with it. you have to trim off some of the bumper and off the edge of the diffuser. depending how much extra material you have. its not uncommon for this to be done. but if you are not comfortable doing it yourself, get it done by someone who does.


and to clarify....cause I know someone will also chime in or have something to say, some exceptions that a part won't require any modification, they will fit great. but again exceptions. not the case all the time, hence the reason I said 90%+
The bumper has the cut edges on the bottom right and left for the aftermarket diffusers. I will add pictures later to show what's going on. I think the carbon was made with a bent shape and that is the problem. I understand carbon fiber products won't fit perfect but mine happens to be one of the worst ones I've seen, sadly.
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      02-21-2017, 12:44 PM   #5
bsmoov
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If anyone is looking for an OEM e90 performance diffuser, check the exterior classified subforum. I have one for sale...
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      02-21-2017, 04:43 PM   #6
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I would return it and roll the dice on a better diffuser. But like socaltrojan said keep in mind that no aftermarket piece is going to come perfect. For example, I bought a diffuser from LTMW which are not cheap and more reputable, and still had to get it professionally installed. Aftermarket cosmetics are rarely plug n play. My guess is you found your way into a chinese replica diffuser whether from ebay or some vendor that resells these parts. If I was you I would spring for a better diffuser and save on the install costs.
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      02-21-2017, 04:46 PM   #7
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You are pre-LCI. Did you buy LCI. I believe they are different.
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      02-21-2017, 05:17 PM   #8
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Quote:
Originally Posted by feuer View Post
You are pre-LCI. Did you buy LCI. I believe they are different.
Not different enough for it not to fit at all.
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      02-21-2017, 05:32 PM   #9
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Not different enough for it not to fit at all.
Well, it could fit willy nilly with zipties, rivets, screws or duct tape I guess but that is beyont the point. There is a difference between pre LCI and LCI and e90 vs 92. We don't know what he got. Photos would help.
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      02-21-2017, 05:49 PM   #10
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Here are the pictures. That's the best I could get it, trying to keep tension off the carbon. (I also need to fix my purple sensors)
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      02-21-2017, 05:57 PM   #11
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Thats actually not as bad as I thought. Professional shop should be able to get that to fit but they'll probably end up glueing it on. Hope you dont plan on ever taking it off...
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      02-21-2017, 05:59 PM   #12
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Have one similar to that and the fitment isn't the greatest, had to play around with it to get it close as possible. Had to put some tension and adjust the mounting points a bit.
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      02-21-2017, 06:01 PM   #13
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If the carbon is pushed back won't it snap? That's already pushed as much as I wanted to. Because I'm thinking to play it safe for now, if it breaks it's worth nothing.
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      02-21-2017, 06:23 PM   #14
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That is LCI diffuser and I think you need other pieces in order to install it properly because the pre LCI and LCI bumpers are different. Check here:
http://www.realoem.com/bmw/enUS/show...diagId=51_6269
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      02-21-2017, 06:41 PM   #15
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That says e92? Just to clarify it's for an e90. Maybe something like this would fix my problem? https://www.turnermotorsport.com/p-7...uine-bmw-part/
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      02-22-2017, 11:12 AM   #16
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Bump (trying to figure this all out)
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      02-22-2017, 12:40 PM   #17
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Quote:
Originally Posted by feuer View Post
Well, it could fit willy nilly with zipties, rivets, screws or duct tape I guess but that is beyont the point. There is a difference between pre LCI and LCI and e90 vs 92. We don't know what he got. Photos would help.
I have an lci diffuser on my pre lci bumper, tiny adjustment no willy nilly zip ties or duct tap so I speak from experience but nothing as bad as the pics.
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      02-22-2017, 12:41 PM   #18
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Quote:
Originally Posted by feuer View Post
That is LCI diffuser and I think you need other pieces in order to install it properly because the pre LCI and LCI bumpers are different. Check here:
http://www.realoem.com/bmw/enUS/show...diagId=51_6269
on an e90 the diffusers are interchangeable with no major issues. What the op is showing here is not related to LCI pre LCI. there are no additional pieces required for the e90, its a one piece diffuser. the e92 is a 2 piece.
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      02-22-2017, 02:18 PM   #19
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Quote:
Originally Posted by imy View Post
on an e90 the diffusers are interchangeable with no major issues. What the op is showing here is not related to LCI pre LCI. there are no additional pieces required for the e90, its a one piece diffuser. the e92 is a 2 piece.
Why are the two holes on each side. I know there are self adhesive stickers that go on each side to cover those. Aren't those corners need to be fasten?
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