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Part Help? Rear Diffuser? 2010 E550

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Old May 27, 2015 | 09:21 AM
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2010 E550 4MATIC RENNtech Tune
Part Help? Rear Diffuser? 2010 E550

Do you guys know what the black plastic piece underneath my bumper is called? It's the piece that covers the dual exhausts and runs the width of the car. Is it a rear diffuser? Anyone know the part # for my 2010 E550? Mine is a bit scratched up by the previous owner and I'm looking at replacing it. How easy is it to replace? Do I have to pull the rear bumper off or can I just go under the car and there are some clips or something?

Thanks!
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Old May 27, 2015 | 02:56 PM
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2010 E550 4MATIC RENNtech Tune
Anyone? I thought this would be an easy one!
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Old May 27, 2015 | 03:07 PM
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Part #12- Lower Cover.
In all seriousness you need to be more resourceful. Ragging on us to find stuff for you is not good in any way.

http://mbonlineparts.com/parts/2010/...iagram=5718790
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Old May 27, 2015 | 03:10 PM
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2010 E550 4MATIC RENNtech Tune
Originally Posted by KEY08
Part #12- Lower Cover.
In all seriousness you need to be more resourceful. Ragging on us to find stuff for you is not good in any way.

http://mbonlineparts.com/parts/2010/...iagram=5718790
Didn't mean to "rag". I had 2 different "opinions" from 2 different Mercedes dealers after my online research. I thought one of you guys would have the experience to clear it up. I'm new to Benz.
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Old May 27, 2015 | 03:14 PM
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I thought its called a diffuser? lol
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Old May 27, 2015 | 03:15 PM
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2010 E550 4MATIC RENNtech Tune
Originally Posted by belarus27
I thought its called a diffuser? lol
That's what I thought..
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Old May 27, 2015 | 03:53 PM
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The part diagram describes it as a "lower cover", so as not to confuse you guys any more than is necessary I referred to it by that specific name. In this application it is more of a cover than anything else. Diffusers usually displace air and and are made of exotic carbon Fiber bits and such, which this "cover" is clearly not. It is a piece of cheap molded plastic.

Please don't thank me for helping you understand the difference between a cheap plastic lower bumper cover and a diffuser.
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Old May 27, 2015 | 04:39 PM
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2010 E550 4MATIC RENNtech Tune
Originally Posted by KEY08
The part diagram describes it as a "lower cover", so as not to confuse you guys any more than is necessary I referred to it by that specific name. In this application it is more of a cover than anything else. Diffusers usually displace air and and are made of exotic carbon Fiber bits and such, which this "cover" is clearly not. It is a piece of cheap molded plastic.

Please don't thank me for helping you understand the difference between a cheap plastic lower bumper cover and a diffuser.
The cheap cover is going for $318 OEM (Dealer). Other sources have it at 250ish. Not so cheap. I'll do further research on pricing.
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Old May 27, 2015 | 05:06 PM
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yes, a lot of money for molded cheezy plastic. However, the one redeeming thing is you will not have to paint it. So, you got that going for you.

Last edited by RA72825; May 27, 2015 at 05:20 PM.
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