4 series fender "vent" retrofit

donavo · 08-15-2018, 11:39 AM

hey guys, i have a 440i 2018 and ive been told that the fender boomerangs have lost their function for my model year. is the actual fender now different or can i just buy the older boomerangs and swap them and regain function? can anything be done on this besides swaping fenders?

1QuikWS6 · 08-15-2018, 11:48 AM

On cars with the vents there is an actual scallop in the fender that they fit into + an actual opening in the fender that matches with the opening in the cosmetic vent + continuation of that opening thru the inner fender liner so that air may flow thru from wheel well

If the openings are gone in the fender/wheel liner it would be pretty tuff to cut one in properly

Would need to see an actual fender that you're talking about.

If no opening, you may be able to retrofit older fender & wheel liner to regain functionality, but seems overly expensive just to add a functional vent

Billfitz · 08-15-2018, 01:41 PM

Can you see through the boomerang? If so it's functional.

IK6SPEED · 08-15-2018, 02:50 PM

Quote:

Originally Posted by donavo

hey guys, i have a 440i 2018 and ive been told that the fender boomerangs have lost their function for my model year. is the actual fender now different or can i just buy the older boomerangs and swap them and regain function? can anything be done on this besides swaping fenders?

Was your car built after 02.28.2017?

donavo · 08-15-2018, 02:55 PM

Quote:

Originally Posted by IK6SPEED

Was your car built after 02.28.2018?

i dont think so. it was a demo car and i believe it has a late 2017 build date.

IK6SPEED · 08-15-2018, 02:58 PM

Quote:

Originally Posted by donavo

i dont think so. it was a demo car and i believe it has a late 2017 build date.

There is a new part number for the fenders, wheel liner and vent starting 3/2017

That may or may not mean anything as it says it’s exchangable with the older part.

FWIW, when I retrofitted vents on my F30, after discussion with shop, decided not to make the the vents functional. They aren’t there (functional) on F30, so I felt it would only possibly pass brake dust through to exterior fender.

donavo · 08-15-2018, 03:19 PM

Quote:

Originally Posted by IK6SPEED

There is a new part number for the fenders, wheel liner and vent starting 3/2017

That may or may not mean anything as it says it’s exchangable with the older part.

FWIW, when I retrofitted vents on my F30, after discussion with shop, decided not to make the the vents functional. They aren’t there (functional) on F30, so I felt it would only possibly pass brake dust through to exterior fender.

hmm so its probably backwards compatible but doesnt have a hole. unfortunate. but thank you for looking into it.

wdeerfield · 08-15-2018, 08:55 PM

I dunno what's worse. Bmw removing the vents on the 4 series or when they favelifted the f10 to move the indicators to the Mirrors and just put a plastic chrome piece where the side marker use to be so they didn't need to press new fenders

Skyhigh · 08-16-2018, 04:28 AM

The yare not backwards compatible! That's what I read, no own experience. Also on all aftermarket "vented" breathers you will notice they are claimed to be only compatible with pre LCI cars.

08-15-2018, 11:39 AM	#1
donavo Enlisted Member 6 Rep 32 Posts Drives: 440i Join Date: Jul 2018 Location: LA iTrader: (0)	4 series fender "vent" retrofit hey guys, i have a 440i 2018 and ive been told that the fender boomerangs have lost their function for my model year. is the actual fender now different or can i just buy the older boomerangs and swap them and regain function? can anything be done on this besides swaping fenders?
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08-15-2018, 11:48 AM	#2
1QuikWS6 No 55mph 1619 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	On cars with the vents there is an actual scallop in the fender that they fit into + an actual opening in the fender that matches with the opening in the cosmetic vent + continuation of that opening thru the inner fender liner so that air may flow thru from wheel well If the openings are gone in the fender/wheel liner it would be pretty tuff to cut one in properly Would need to see an actual fender that you're talking about. If no opening, you may be able to retrofit older fender & wheel liner to regain functionality, but seems overly expensive just to add a functional vent __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit Last edited by 1QuikWS6; 08-15-2018 at 03:12 PM..
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08-15-2018, 01:41 PM	#3
Billfitz Lieutenant General 8225 Rep 16,063 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Can you see through the boomerang? If so it's functional.
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08-15-2018, 08:55 PM	#8
wdeerfield A family of bimmers 2745 Rep 7,741 Posts Drives: '18 G01 X3M40i Join Date: Jan 2012 Location: Clifton Park, NY iTrader: (0)	I dunno what's worse. Bmw removing the vents on the 4 series or when they favelifted the f10 to move the indicators to the Mirrors and just put a plastic chrome piece where the side marker use to be so they didn't need to press new fenders __________________ 2018 PB/Black G01 X3M40i \| 699M \| ZDA \| ZPP \| ZPX \| Maxton front lip \| X3M vents \| 15mm Spacers \| Diamond G20 style grills
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08-16-2018, 04:28 AM	#9
Skyhigh Brigadier General 1879 Rep 3,862 Posts Drives: BMW F36 Join Date: Apr 2018 Location: Europe iTrader: (0)	The yare not backwards compatible! That's what I read, no own experience. Also on all aftermarket "vented" breathers you will notice they are claimed to be only compatible with pre LCI cars. __________________ "Large increases in cost with questionable increases in performance can be tolerated only in cars and women."
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