3 Piece Cardon Diffuser not fitting flush

KnockTsuKow · 04-07-2023, 02:25 AM

Recently installed a 3 piece aftermkt carbon rear diffuser for my F80 m3 and noticed the right wing is not as flush as the left, is this normal?

How do I fit it more flush, I was thinking of taking it off and sanding the right wing diffuser down to more flat so it fits better on the bumper, any thoughts or advice on this?

Went with the middle grade one paying like $350 for it vs the $120 ebays one.

DeezBluBallz · 04-08-2023, 12:50 PM

So..... Photos would help.

trungnguyen28 · 04-09-2023, 01:31 PM

It's absolutely normal that knock off CF will have hit or miss fitment issues.
$350 vs. $120 is essentially the same thing. They all China/Alibaba manufactured.

I would just add screws to the edges where it's sagging.

TopJimmy · 04-09-2023, 03:03 PM

3M VHB tape, half inch or wider. Stick that bitch. I used wide VHB (and screws) to mount all my spoilers/diffusers and they held up to many 160-170MPH runs.

Danlnyc88 · 04-09-2023, 06:00 PM

Quote:

Originally Posted by KnockTsuKow

Recently installed a 3 piece aftermkt carbon rear diffuser for my F80 m3 and noticed the right wing is not as flush as the left, is this normal?

How do I fit it more flush, I was thinking of taking it off and sanding the right wing diffuser down to more flat so it fits better on the bumper, any thoughts or advice on this?

Went with the middle grade one paying like $350 for it vs the $120 ebays one.

There is no guarantee that the 350 vs 120 one will fit any better. If anything the 350 guy marked his up more with better marketing/pictures.

I would just put 3m on the side of that and push it in as much as you can.

KnockTsuKow · 04-10-2023, 01:59 AM

THx, I am thinking off taking it out and shave the middle till more flat and re-fitted it, or am I nuts? lOL

henizwhoa · 04-13-2023, 09:23 AM

I bought my V-style 3-piece diffuser from Horizon Motorsport (not eBay knockoff) and also have same small gap. I knew before purchasing this because it stated in the the description "There will be a small gap between the center piece and side extensions, if you are on the pickier side, we recommend purchasing the P Style diffuser, which is also available on our site". To be honest, it doesn't bother me a bit. It is not as noticeable as having a gap on the front lip.

KnockTsuKow · 04-14-2023, 12:37 AM

thanks for the feedback and u have a link to tghe P style?

henizwhoa · 04-16-2023, 08:38 PM

Quote:

Originally Posted by KnockTsuKow

thanks for the feedback and u have a link to tghe P style?

https://horizonmotorsport.com/collec...rbon-undertray

04-07-2023, 02:25 AM	#1
KnockTsuKow Second Lieutenant 56 Rep 240 Posts Drives: f80 Join Date: Jul 2012 Location: Orange County, CA iTrader: (1)	3 Piece Cardon Diffuser not fitting flush Recently installed a 3 piece aftermkt carbon rear diffuser for my F80 m3 and noticed the right wing is not as flush as the left, is this normal? How do I fit it more flush, I was thinking of taking it off and sanding the right wing diffuser down to more flat so it fits better on the bumper, any thoughts or advice on this? Went with the middle grade one paying like $350 for it vs the $120 ebays one. Attached Images Last edited by KnockTsuKow; 04-09-2023 at 12:59 AM.. Reason: pic
	Appreciate 0 Tweet Quote

04-08-2023, 12:50 PM	#2
DeezBluBallz Second Lieutenant 162 Rep 264 Posts Drives: Audi RS5, BMW M3 Join Date: Jun 2019 Location: Omaha, NE iTrader: (0)	So..... Photos would help.
	Appreciate 1 MrRager0132.50 Quote

04-09-2023, 01:31 PM	#3
trungnguyen28 Second Lieutenant 51 Rep 220 Posts Drives: 2015 BMW M3 Join Date: Nov 2018 Location: California iTrader: (7)	It's absolutely normal that knock off CF will have hit or miss fitment issues. $350 vs. $120 is essentially the same thing. They all China/Alibaba manufactured. I would just add screws to the edges where it's sagging.
	Appreciate 0 Quote

04-09-2023, 03:03 PM	#4
TopJimmy Major General 5463 Rep 5,155 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	3M VHB tape, half inch or wider. Stick that bitch. I used wide VHB (and screws) to mount all my spoilers/diffusers and they held up to many 160-170MPH runs. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
	Appreciate 0 Quote

04-10-2023, 01:59 AM	#6
KnockTsuKow Second Lieutenant 56 Rep 240 Posts Drives: f80 Join Date: Jul 2012 Location: Orange County, CA iTrader: (1)	THx, I am thinking off taking it out and shave the middle till more flat and re-fitted it, or am I nuts? lOL
	Appreciate 0 Quote

04-13-2023, 09:23 AM	#7
henizwhoa Enlisted Member 8 Rep 31 Posts Drives: 2017 F83 AW M+E package Join Date: Feb 2017 Location: San Jose iTrader: (0)	I bought my V-style 3-piece diffuser from Horizon Motorsport (not eBay knockoff) and also have same small gap. I knew before purchasing this because it stated in the the description "There will be a small gap between the center piece and side extensions, if you are on the pickier side, we recommend purchasing the P Style diffuser, which is also available on our site". To be honest, it doesn't bother me a bit. It is not as noticeable as having a gap on the front lip.
	Appreciate 0 Quote

04-14-2023, 12:37 AM	#8
KnockTsuKow Second Lieutenant 56 Rep 240 Posts Drives: f80 Join Date: Jul 2012 Location: Orange County, CA iTrader: (1)	thanks for the feedback and u have a link to tghe P style?
	Appreciate 0 Quote