Carbon fiber diffuser with square tips

650GC · 10-08-2018, 05:37 PM

I found this cheap carbon fiber diffuser someone was selling on eBay which I think looks a lot better than factory diffuser.
The only reason I went aftermarket was due to factory diffuser was missing one piece which holds the bottom of the diffuser. Buying that single piece was more than this aftermarket diffuser.

I'm looking to install dual tips on factory exhaust by cutting the square tips.

Any recommendations? Can I go with 3" tips without problem?

AZ_Bmw_550 · 10-08-2018, 06:50 PM

I have a different CF diffuser on my 650i and was able to do quad 3.5 inch tips easily. It looks like your openings are a little smaller, but it's easy to test. Cut out some 3 inch circles from paper and mock it up...

650GC · 10-08-2018, 07:17 PM

Quote:

Originally Posted by AZ_Bmw_550

I have a different CF diffuser on my 650i and was able to do quad 3.5 inch tips easily. It looks like your openings are a little smaller, but it's easy to test. Cut out some 3 inch circles from paper and mock it up...

Can you post a picture of your tips, did you do any other modification other than cutting the square tips?

DerBosewicht · 10-09-2018, 05:42 AM

Definitely want to do 3.5. One picture is with the 3.5 and 4 inches on one side and the other is just3.5 on the factory diffuser. That is a nice come up though on your diffuser.

650GC · 10-09-2018, 06:32 AM

Quote:

Originally Posted by DerBosewicht

Definitely want to do 3.5. One picture is with the 3.5 and 4 inches on one side and the other is just3.5 on the factory diffuser. That is a nice come up though on your diffuser.

I like how your car looks but It looks like you used aftermarket exhausts. I want to keep the factory exhaust and replace the square tips with dual tips. If 3.5 can't work, than 3" will work for sure I think. I just want to see if anyone tried dual tips on factory exhaust.

Ptoscano911 · 10-09-2018, 11:56 AM

It has been done but tedious work. Just buy m6 mufflers

AZ_Bmw_550 · 10-09-2018, 08:17 PM

These are quad 3.5in tips on M6 mufflers.

Margas · 10-09-2018, 11:25 PM

I have the same diffuser with M5 mufflers which have 3" tips which fit perfectly. 3.5" should work too.

BMPOWERED · 10-10-2018, 12:10 AM

Quote:

Originally Posted by Ptoscano911

It has been done but tedious work. Just buy m6 mufflers

Agreed. The problem is that the round tips that are inside of your trapezoids are too close together to allow for 3.5" tips.

mrjsmith88 · 10-10-2018, 09:03 AM

Quote:

Originally Posted by 650GC

I found this cheap carbon fiber diffuser someone was selling on eBay which I think looks a lot better than factory diffuser.
The only reason I went aftermarket was due to factory diffuser was missing one piece which holds the bottom of the diffuser. Buying that single piece was more than this aftermarket diffuser.

I'm looking to install dual tips on factory exhaust by cutting the square tips.

Any recommendations? Can I go with 3" tips without problem?

Got better pics bro like back up a lil I wanna keep my stock exhaust lol

FBMWWINS · 10-14-2018, 02:53 PM

What do you people think of this one?

https://www.ebay.de/itm/401552033144?ul_noapp=true

Anyone knows Carbonstar? Seems to be fine stuff (material) and price reflects it. How do you judge the looks of this diffusor when paired with the original pipes?

https://i.ebayimg.com/images/g/GbAAA...Hk/s-l1600.jpg

Havy · 10-14-2018, 03:12 PM

If I didn’t have the damn problem with our TÜV I would have ordered already stuff from them as they seam to be of good quality. The base is here in Germany as Farbauswahl I know.

FBMWWINS · 10-14-2018, 03:18 PM

Indeed I always look to order stuff from Germany as I do not live very far. It appears to be of good quality. Also they describe their product carefully and guarantee it is 100% real carbon. And for that price it should be also.

Speaking of TÜV I would probably run into the same problem here in Swiss Land but my 1st inspection is in 2022 so I could "gamble" and remove it then in case they make stories. But that is really far away......
I thought though it was "eintragungsfrei".

Havy · 10-14-2018, 04:11 PM

no all parts which are bolted or glued on must be „eingetragen“ here.

Havy · 01-03-2019, 04:37 AM

So guys, I installed the Carbonstar diffusor.

the fitment is ok. You have to add some screws as the snap in latches are not as effective as they should.
BUT.....now I can see the lower part of the trunk.

does anybody have the same problem?

M6KnightRider · 01-04-2019, 12:38 PM

I'm selling some of my carbon fiber add on if anyone is interested. dinmann front splitter, Vicrez rear trunk spoiler. Upper part of the diffuser, I think its called valance, kidney grill, side mirror covers. PM for prices. Splitter and spoiler are new.

Havy · 01-04-2019, 02:05 PM

M6KnightRider
Now you are coming with those parts.

You should post it here
Member‘s Classifieds

By the way, I solved the problem with the gap. The diffusor just stuck in place and as soon as I removed it everything was good.

suliman · 01-05-2019, 09:06 PM

Quote:

Originally Posted by AZ_Bmw_550

These are quad 3.5in tips on M6 mufflers.

I have a 640 do i need to change the bumper in order to fit the diffuser, muffler,tips?

Havy · 01-06-2019, 05:05 AM

It depends on what you want to change. If you find a diffusor for your car no change needed. I believe the most diffusor are for the M-bumper. The same applies for the muffler tips. If you find parts for your car no changes required.

FBMWWINS · 01-12-2019, 01:22 PM

Cool Havy you finally did it. So you are now 100% happy with the result I guess?

Havy · 01-12-2019, 03:35 PM

Oh yes, absolutely.

I think it is the best price-performance. The fitment is good as well.

Carbonstar have more of those parts.

jjasonSU · 01-15-2019, 10:21 AM

Quote:

Originally Posted by Havy

Oh yes, absolutely.

I think it is the best price-performance. The fitment is good as well.

Carbonstar have more of those parts.

It looks good Havy 650GC
Can you post the eBay link or Seller name?

10-08-2018, 05:37 PM	#1
650GC New Member 15 Rep 16 Posts Drives: 2013 BMW 650i Gran Coupe Join Date: Sep 2018 Location: Toronto, Ontario iTrader: (0)	I found this cheap carbon fiber diffuser someone was selling on eBay which I think looks a lot better than factory diffuser. The only reason I went aftermarket was due to factory diffuser was missing one piece which holds the bottom of the diffuser. Buying that single piece was more than this aftermarket diffuser. I'm looking to install dual tips on factory exhaust by cutting the square tips. Any recommendations? Can I go with 3" tips without problem? Attached Images
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10-08-2018, 06:50 PM	#2
AZ_Bmw_550 Private First Class 52 Rep 183 Posts Drives: 2015 BMW 650i GC Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2011 BMW 550i [0.00]	I have a different CF diffuser on my 650i and was able to do quad 3.5 inch tips easily. It looks like your openings are a little smaller, but it's easy to test. Cut out some 3 inch circles from paper and mock it up...
	Appreciate 1 650GC14.50 Quote

10-09-2018, 05:42 AM	#4
DerBosewicht Problem Solver 111 Rep 416 Posts Drives: 640i Gran Coupe Join Date: Jan 2018 Location: TX iTrader: (1)	Definitely want to do 3.5. One picture is with the 3.5 and 4 inches on one side and the other is just3.5 on the factory diffuser. That is a nice come up though on your diffuser. Attached Images
	Appreciate 1 650GC14.50 Quote

10-09-2018, 11:56 AM	#6
Ptoscano911 First Lieutenant 29 Rep 302 Posts Drives: F90 M5 Join Date: Jul 2018 Location: Long Island iTrader: (0)	It has been done but tedious work. Just buy m6 mufflers
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10-09-2018, 08:17 PM	#7
AZ_Bmw_550 Private First Class 52 Rep 183 Posts Drives: 2015 BMW 650i GC Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2011 BMW 550i [0.00]	These are quad 3.5in tips on M6 mufflers. Attached Images
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10-09-2018, 11:25 PM	#8
Margas Private 18 Rep 94 Posts Drives: F06 640i / E30 325ic Join Date: Sep 2017 Location: Vancouver iTrader: (0)	I have the same diffuser with M5 mufflers which have 3" tips which fit perfectly. 3.5" should work too.
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10-14-2018, 02:53 PM	#11
FBMWWINS Captain 604 Rep 909 Posts Drives: M8C Coupé & M240i Coupé Join Date: Nov 2011 Location: Europe iTrader: (0)	What do you people think of this one? https://www.ebay.de/itm/401552033144?ul_noapp=true Anyone knows Carbonstar? Seems to be fine stuff (material) and price reflects it. How do you judge the looks of this diffusor when paired with the original pipes? https://i.ebayimg.com/images/g/GbAAA...Hk/s-l1600.jpg
	Appreciate 0 Quote

10-14-2018, 03:12 PM	#12
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	If I didn’t have the damn problem with our TÜV I would have ordered already stuff from them as they seam to be of good quality. The base is here in Germany as Farbauswahl I know.
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10-14-2018, 03:18 PM	#13
FBMWWINS Captain 604 Rep 909 Posts Drives: M8C Coupé & M240i Coupé Join Date: Nov 2011 Location: Europe iTrader: (0)	Indeed I always look to order stuff from Germany as I do not live very far. It appears to be of good quality. Also they describe their product carefully and guarantee it is 100% real carbon. And for that price it should be also. Speaking of TÜV I would probably run into the same problem here in Swiss Land but my 1st inspection is in 2022 so I could "gamble" and remove it then in case they make stories. But that is really far away...... I thought though it was "eintragungsfrei".
	Appreciate 0 Quote

10-14-2018, 04:11 PM	#14
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	no all parts which are bolted or glued on must be „eingetragen“ here.
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01-03-2019, 04:37 AM	#15
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	So guys, I installed the Carbonstar diffusor. the fitment is ok. You have to add some screws as the snap in latches are not as effective as they should. BUT.....now I can see the lower part of the trunk. does anybody have the same problem? Attached Images Last edited by Havy; 01-04-2019 at 10:29 AM.. Reason: Spelling
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01-04-2019, 12:38 PM	#16
M6KnightRider New Member 1 Rep 13 Posts Drives: 2014 BMW M6(comp pack) Join Date: Jan 2019 Location: FL iTrader: (0)	I'm selling some of my carbon fiber add on if anyone is interested. dinmann front splitter, Vicrez rear trunk spoiler. Upper part of the diffuser, I think its called valance, kidney grill, side mirror covers. PM for prices. Splitter and spoiler are new.
	Appreciate 0 Quote

01-04-2019, 02:05 PM	#17
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	M6KnightRider Now you are coming with those parts. You should post it here Member‘s Classifieds By the way, I solved the problem with the gap. The diffusor just stuck in place and as soon as I removed it everything was good. Last edited by Havy; 01-06-2019 at 05:05 AM.. Reason: Spelling
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01-06-2019, 05:05 AM	#19
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	It depends on what you want to change. If you find a diffusor for your car no change needed. I believe the most diffusor are for the M-bumper. The same applies for the muffler tips. If you find parts for your car no changes required.
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01-12-2019, 01:22 PM	#20
FBMWWINS Captain 604 Rep 909 Posts Drives: M8C Coupé & M240i Coupé Join Date: Nov 2011 Location: Europe iTrader: (0)	Cool Havy you finally did it. So you are now 100% happy with the result I guess?
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01-12-2019, 03:35 PM	#21
Havy Captain 303 Rep 709 Posts Drives: BMW X5 M50i Join Date: Sep 2018 Location: Europe iTrader: (0)	Oh yes, absolutely. I think it is the best price-performance. The fitment is good as well. Carbonstar have more of those parts.
	Appreciate 0 Quote