Rear axle cover (diffuser)

Zubek · 05-06-2015, 09:53 AM

While searching for the OEM M5 diffuser I came across this part. It's a genuine BMW part (#51128055229) that pretty much covers back everything from rear axle. I've never seen it on the car itself and wondering if someone has it mounted on the car or has a picture of it. Curious if it's much visible form the back of the vehicle.

Best
Z.

SchillerM · 05-12-2018, 07:34 PM

Yes I know this is a 3yo (and 6 day) thread. But there was no answer and I see no other and no other results in searching, and since this guy too the time to provide pics and details its easier..

So, any pics of this on car? Just put new bumper on my 550i and am curious about it.
Matt

daniel_f10 · 05-12-2018, 10:27 PM

I wonder if this would fit under a 2013 550i

weeman6556 · 05-13-2018, 02:31 AM

Hi there,

It’s definitely the rear axle undertray for aero only, I believe it’s plastic or that fuzzy material. The diffuser attaches to it with the torx screws (3 from memory)
I’d say unless your on a massive decline e.g. multi story car park ramp, it’s completely impossible to see. The diffuser is all you can see.

As for fitment to 550i I cannot comment, sorry.

05-06-2015, 09:53 AM	#1
Zubek Private First Class 49 Rep 149 Posts Drives: BMW Join Date: Sep 2014 Location: Netherlands/U.S iTrader: (0)	Rear axle cover (diffuser) While searching for the OEM M5 diffuser I came across this part. It's a genuine BMW part (#51128055229) that pretty much covers back everything from rear axle. I've never seen it on the car itself and wondering if someone has it mounted on the car or has a picture of it. Curious if it's much visible form the back of the vehicle. Best Z. Attached Images
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05-12-2018, 07:34 PM	#2
SchillerM First Lieutenant 90 Rep 333 Posts Drives: 11' 550i, '00 M5, '11 E90 335i Join Date: Apr 2014 Location: Vancouver, WA iTrader: (0)	Yes I know this is a 3yo (and 6 day) thread. But there was no answer and I see no other and no other results in searching, and since this guy too the time to provide pics and details its easier.. So, any pics of this on car? Just put new bumper on my 550i and am curious about it. Matt
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05-12-2018, 10:27 PM	#3
daniel_f10 Enlisted Member 2 Rep 44 Posts Drives: BMW 550i Join Date: Sep 2016 Location: Indiana iTrader: (1)	I wonder if this would fit under a 2013 550i
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05-13-2018, 02:31 AM	#4
weeman6556 New Member 4 Rep 11 Posts Drives: f10 M5 Join Date: Mar 2017 Location: Scotland iTrader: (0)	Hi there, It’s definitely the rear axle undertray for aero only, I believe it’s plastic or that fuzzy material. The diffuser attaches to it with the torx screws (3 from memory) I’d say unless your on a massive decline e.g. multi story car park ramp, it’s completely impossible to see. The diffuser is all you can see. As for fitment to 550i I cannot comment, sorry.
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