Rear Diffuser Install

BimmerMad · 02-20-2017, 07:57 AM

I'm hoping to install my M Performance replica rear diffuser tonight.

As far as I'm aware, I just unbolt the original one and reuse the same bolts to attach the new one.

Does anyone have a more detailed guide or any pics of underneath the car showing what I need to unbolt?

teaston · 02-20-2017, 09:30 AM

It's very obvious what you have to unbolt when you look under it.

What I will recommend is filing off the moulding lip along the top of the diffuser so you can get the top clips in properly, you could do with one of those semi circular files to file down the curved bits nicely.

When you fit it get the middle clips in properly before trying to clip the ends in, as this will straighten the diffuser and make it long enough to reach.

Bianchi Dave · 02-20-2017, 09:52 AM

Quote:

Originally Posted by RDowson

I'm hoping to install my M Performance replica rear diffuser tonight.

As far as I'm aware, I just unbolt the original one and reuse the same bolts to attach the new one.

Does anyone have a more detailed guide or any pics of underneath the car showing what I need to unbolt?

Is it good quality? Tracking showing that mine has been in Germany since Friday, not the quickest shipment but can't complain as its free!

I may have to give in and buy the MP active exhaust too. Waiting on dealership to confirm if old one can be refitted when I change cars....

BimmerMad · 02-20-2017, 10:06 AM

Quote:

Originally Posted by Bianchi Dave

Quote:

Originally Posted by RDowson

I'm hoping to install my M Performance replica rear diffuser tonight.

As far as I'm aware, I just unbolt the original one and reuse the same bolts to attach the new one.

Does anyone have a more detailed guide or any pics of underneath the car showing what I need to unbolt?

Is it good quality? Tracking showing that mine has been in Germany since Friday, not the quickest shipment but can't complain as its free!

I may have to give in and buy the MP active exhaust too. Waiting on dealership to confirm if old one can be refitted when I change cars....

It's at the depot waiting on my picking it up tonight. Hoping to get it in the garage and fitted tonight.

Xnfris · 02-20-2017, 10:29 AM

I agree that filing the lip and any excess plastic from the molding process. I used a half round file. It only took me about 15 mins to swap out. Mine had about 1/4 inch of play side to side so starting in the middle is a good way to get it centered so it fits right on both ends.

BimmerMad · 02-20-2017, 03:53 PM

That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser.

Can anyone do a better price than £270 for it?

ajfoggy · 02-20-2017, 03:56 PM

Quote:

Originally Posted by RDowson

That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser.

Can anyone do a better price than £270 for it?

Got any Pics? Can't believe it would be that bad

teaston · 02-20-2017, 03:59 PM

Quote:

Originally Posted by RDowson

That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser.

Can anyone do a better price than £270 for it?

Did you get the middle clipped in properly?

UKF30 · 02-20-2017, 04:01 PM

Quote:

Originally Posted by RDowson

That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser.

Can anyone do a better price than £270 for it?

Oh man that's bad but I have fitted after market and there is one little gap which is not obvious when you look at it .

But if you want perfect look than OEM is way to go mate .

Have you still got it fitted , if then post some pics ?

BimmerMad · 02-20-2017, 04:20 PM

Don't have it fitted anymore. Couldn't even get all the bolts to line up.

Got the original one back on now but the reflectors don't seem to sit as flush as they did. Do you just need to spend more time fiddling with it to get them to sit right?

Stoo · 02-20-2017, 04:30 PM

Try bluebell BMW in Crewe

I paid 225 for an f36 rear diffuser last week

UKF30 · 02-20-2017, 04:36 PM

Quote:

Originally Posted by RDowson

Don't have it fitted anymore. Couldn't even get all the bolts to line up.

Got the original one back on now but the reflectors don't seem to sit as flush as they did. Do you just need to spend more time fiddling with it to get them to sit right?

I spent about half hour myself to fit it and as I said before you start from one side and work towards other .

You can fit it and you won't even notice gaps on either side as these too small but your choice mate

BimmerMad · 02-20-2017, 04:42 PM

Quote:

Originally Posted by Stoo

Try bluebell BMW in Crewe

I paid 225 for an f36 rear diffuser last week

Thanks. I've sent them a message to see if they can do the same deal.

Did they deliver yours or did you collect it? I'm near Glasgow so won't be able to collect it.

Stoo · 02-20-2017, 04:43 PM

I got a deal on a load of bits at once.

SteveChester · 02-20-2017, 04:49 PM

I'm thinking about getting one - anyone got a link for a decent non OEM fitting one ?

Bianchi Dave · 02-21-2017, 12:16 PM

I fitted my diffuser today, the £86 Kitt Tuning one from ebay. Appears identical to what I've seen of the DM Autoteile ones (made of polypropylene in Taiwan). A nightmare to fit though, had to file down the top edge as suggested by Teaston (thanks for that).

It's not quite wide enough as a few have said. There's a 4mm gap either side which I can live with for now. However the finish is very smooth and looks good so for the money its not bad. May still buy a genuine one though.....

BimmerMad · 02-21-2017, 12:41 PM

I got a genuine one ordered today from Blue Bell BMW in Crewe.

Great price and it'll be delivered tomorrow!

Bianchi Dave · 02-21-2017, 12:45 PM

Quote:

Originally Posted by RDowson

I got a genuine one ordered today from Blue Bell BMW in Crewe.

Great price and it'll be delivered tomorrow!

How much? PM if you prefer, cheers

Gixerste · 02-21-2017, 01:22 PM

Quote:

Originally Posted by RDowson

That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser.

Can anyone do a better price than £270 for it?

Sorry to hear that I bought one from dm-autoteile and the fit was very good, I didn't even file anything on it. They must be getting some from a different supplier.

jang150 · 02-21-2017, 03:22 PM

I know how you feel Bianchi Dave. Mines not a great fit either. It remains on for now but still niggling me. Don't fancy getting another non genuine with same issue. Tempted to stick with original diffuser as performance one is quite subtle mod anyway.

00Singh · 02-21-2017, 04:24 PM

Quote:

Originally Posted by RDowson

I got a genuine one ordered today from Blue Bell BMW in Crewe.

Great price and it'll be delivered tomorrow!

In case you still need another place, I got mine from Mstyle in Essex.
Is a quad however.

BimmerMad · 02-23-2017, 04:40 PM

Got my OEM diffuser installed today.

Fits perfectly.

02-20-2017, 07:57 AM	#1
BimmerMad Lieutenant 94 Rep 517 Posts Drives: 3 wheeler Join Date: Aug 2012 Location: UK iTrader: (0)	Rear Diffuser Install I'm hoping to install my M Performance replica rear diffuser tonight. As far as I'm aware, I just unbolt the original one and reuse the same bolts to attach the new one. Does anyone have a more detailed guide or any pics of underneath the car showing what I need to unbolt?
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02-20-2017, 09:30 AM	#2
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	It's very obvious what you have to unbolt when you look under it. What I will recommend is filing off the moulding lip along the top of the diffuser so you can get the top clips in properly, you could do with one of those semi circular files to file down the curved bits nicely. When you fit it get the middle clips in properly before trying to clip the ends in, as this will straighten the diffuser and make it long enough to reach.
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02-20-2017, 10:29 AM	#5
Xnfris Private First Class 44 Rep 117 Posts Drives: 2016 328i m sport Join Date: Jan 2017 Location: California iTrader: (0) Garage List 2016 BMW 328i [0.00]	I agree that filing the lip and any excess plastic from the molding process. I used a half round file. It only took me about 15 mins to swap out. Mine had about 1/4 inch of play side to side so starting in the middle is a good way to get it centered so it fits right on both ends.
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02-20-2017, 03:53 PM	#6
BimmerMad Lieutenant 94 Rep 517 Posts Drives: 3 wheeler Join Date: Aug 2012 Location: UK iTrader: (0)	That was a complete waste of time and money. The lip doesn't fit. Massive gaps each side. Need to return it at my cost now and look at getting the OEM diffuser. Can anyone do a better price than £270 for it?
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02-20-2017, 04:20 PM	#10
BimmerMad Lieutenant 94 Rep 517 Posts Drives: 3 wheeler Join Date: Aug 2012 Location: UK iTrader: (0)	Don't have it fitted anymore. Couldn't even get all the bolts to line up. Got the original one back on now but the reflectors don't seem to sit as flush as they did. Do you just need to spend more time fiddling with it to get them to sit right?
	Appreciate 0 Quote

02-20-2017, 04:30 PM	#11
Stoo First Lieutenant 134 Rep 356 Posts Drives: F36 Join Date: Feb 2017 Location: West Midlands iTrader: (0)	Try bluebell BMW in Crewe I paid 225 for an f36 rear diffuser last week
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02-20-2017, 04:43 PM	#14
Stoo First Lieutenant 134 Rep 356 Posts Drives: F36 Join Date: Feb 2017 Location: West Midlands iTrader: (0)	I got a deal on a load of bits at once.
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02-20-2017, 04:49 PM	#15
SteveChester Brigadier General 2472 Rep 4,653 Posts Drives: F82 M4 Join Date: Oct 2009 Location: Chester iTrader: (0) Garage List 2014 BMW F82 M4 [0.00]	I'm thinking about getting one - anyone got a link for a decent non OEM fitting one ? __________________ Steve Roberts UK F82 M4 I'm running the 2024 London Marathon for the British Forces Foundation - https://www.justgiving.com/fundraising/sr5/
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02-21-2017, 12:16 PM	#16
Bianchi Dave Lieutenant 339 Rep 535 Posts Drives: G21 M340i Join Date: Mar 2016 Location: Angus iTrader: (0)	I fitted my diffuser today, the £86 Kitt Tuning one from ebay. Appears identical to what I've seen of the DM Autoteile ones (made of polypropylene in Taiwan). A nightmare to fit though, had to file down the top edge as suggested by Teaston (thanks for that). It's not quite wide enough as a few have said. There's a 4mm gap either side which I can live with for now. However the finish is very smooth and looks good so for the money its not bad. May still buy a genuine one though.....
	Appreciate 0 Quote

02-21-2017, 12:41 PM	#17
BimmerMad Lieutenant 94 Rep 517 Posts Drives: 3 wheeler Join Date: Aug 2012 Location: UK iTrader: (0)	I got a genuine one ordered today from Blue Bell BMW in Crewe. Great price and it'll be delivered tomorrow!
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02-21-2017, 03:22 PM	#20
jang150 Private First Class 29 Rep 100 Posts Drives: Bmw F30 320d m sport Join Date: Oct 2014 Location: blackburn iTrader: (0)	I know how you feel Bianchi Dave. Mines not a great fit either. It remains on for now but still niggling me. Don't fancy getting another non genuine with same issue. Tempted to stick with original diffuser as performance one is quite subtle mod anyway.
	Appreciate 0 Quote

02-23-2017, 04:40 PM	#22
BimmerMad Lieutenant 94 Rep 517 Posts Drives: 3 wheeler Join Date: Aug 2012 Location: UK iTrader: (0)	Got my OEM diffuser installed today. Fits perfectly. Last edited by BimmerMad; 12-05-2018 at 07:41 AM..
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