C63 Diffuser install for 2012+ W204 (Pics)
 

Hey guys,

This is considered a pretty easy install, but I had some trouble getting concrete information on the install for a facelift W204. (i.e. brackets, rivets, etc) Here are some of the things I noticed:

1.) You NEED brackets for rigidity. Most ebay sellers of this diffuser will tell you otherwise, but plan on purchasing them (~$50). Part numbers are: Diffuser - A204 885 39 38, Left Bracket - A204 885 46 14, Right bracket - A204 885 47 14. I bought mine from my dealer.

2.) The original diffuser is riveted to the bumper on both sides. I drilled them out and replaced them with stainless steel screws and a nylon locknut.

Attachment 447885

3.) The C63 bracket kind of clamps around the back of the bumper, and clips to the tab pushed through the bumper. It's a little difficult to get together properly.
Attachment 447886

Otherwise, fairly easy. Take off your original exhaust tips, and unscrew the hex bolt holding on the original brackets. Drill out the rivets, and pull off the diffuser starting from one side. Apply some grease to the tabs of the new diffuser, and have a buddy hold up the diffuser while you attach the brackets correctly and push in the tabs.

Booked to get my quad tips welded on in a couple days!
Attachment 447887

great thanks, been looking for that part number for quite sometime now. Post final pics!

Cool...
 

Now you're telling me. I slapped in the C63 diffuser on my C250 this morning. Took me a while to figure out that in fact there is aluminum rivet on both sides. Flashlight and small mirror confirmed that. I snipped off that darn Alunimum Rivet using side cutter plier. It came off easily for me. I use Stainless Philip head Screw and Nut with Star washer attached.
Wish I had known the part# for the Bracket sooner. But I have a can do attitude and would do just about anything to make it work. I re-installed the old Brackets and secured the bottom part of the diffuser with fastener. It's solid!
I tossed all the exhaust mod parts in the trunk and drove around looking for Muffler Shop but no go. They're all close on weekend:eek:

where are you located? I've noticed here too lots of places close on weekends. sucks for people like myself who work in the city during the week. weekends are the only time I can get anything done. :smash:

^ SoCal. Profile updated, thanks.
I will call in sick for work on Monday and take the car to the Muffler shop:zoom:

lol..seriously..sucks man

thanks for the part numbers!!.....cant wait to see the final product!

Got the tips welded on, overall very satisfied!
Attachment 447871
Attachment 447872
Attachment 447873
Attachment 447874

Ditto...C250
 

Y pipe is used after the resonator and installed Magnaflow 11365 Muffler on each side. Shop did a good job. He fabricated exhaust hanger similar to the orig and even painted the exhaust pipe black.:y

Did your c63 diffuser already have holes drilled or did you do them yourself?

The only holes that you need are drilled, this is an OEM part.

So you got the OEM diffuser from your local MB shop? Or did you get it online? What do these diffusers run? Thanks

Here's a few made for facelift 2012 and up. Can't go wrong with $80 free shipping. If you want OEM, I suggest checking in the c63 forum or Classified section.

http://www.ebay.com/itm/MB-C-Class-W204-12-14-C63-AMG-Style-Rear-Bumper-AERO-Diffuser-Black-/171323127209?pt=Motors_Car_Truck_Parts_Accessories&hash=item27e3a775a9&vxp=mtr
http://www.ebay.com/itm/2012-2014-MERCEDES-BENZ-W204-C204-C-CLASS-AMG-STYLE-REAR-DIFFUSER-/191528478441?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c97fca6e9&vxp=mtr

Yeah $80 is actually not bad at all. It says direct bolt on. I assume that's not correct, I will still need the brackets right?

you can buy the OEM C63 diffuser from your dealer for $150, + $25 for each bracket.

Correction: From what I read from another member you can reuse your existing bracket on FL w204? Post 125 here.
https://mbworld.org/forums/c-class-w...ml#post6013062

the guy asking has a 2013. this thread is also titled install for 2012+. and the brackets are pretty much necessary, very little support without them.

Looking at both ebay images it looks like the brackets are included. 1st listing says direct bolt on. 2nd listing also say no additional hardware needed.

Nice ALberta Benz bro! Looks like the outside passenger exhaust pipe is welded crooked. I could be wrong.

It was a little crooked unfortunately, just a defect in how the tips were prewelded when i bought the set. I was going to buy a replacement, but it didn't bother me that much. My tips are (More properly) sticking out from the diffuser less now, so it's not as noticeable.

Yup. When I pulled the brackets out and compared them (FL models) I couldn't tell the difference between them and the new ones I got for the AMG diffuser.

Pre FL are different.

the brackets on my OEM diffuser and the brackets I bought for the C63 diffuser were very obviously different.

Weird. I wonder if its because I have a C350?

The stock part numbers are
A2048854414
A2048854514

in EPC (C350, not c63)

Though when I googled that part number for images, it looks like a different part than I had on my car. I bought mine used so who knows. It had the stock diffuser on it.

If you look at any of the ebay listings I posted, do the brackets that come with them look to be correct?

You know what, I'll just go out in the garage tonight and look at the ones I took off. I seem to remember them having more cross bracing, but its been a long time since I looked at them. I know for sure when I pulled them off they looked the same as the new ones.