C7 Carbon Rear Diffuser Install + Review
Thread Starter
Safety Car
Joined: Nov 2011
Posts: 3,555
Likes: 637
C7 Carbon Rear Diffuser Install + Review New Pics
bought a carbon fiber rear diffuser from C7 Carbon.it was listed as a blem and on sale for $399 shipped,instead of $649 plus shipping.i said that was a good price seeing that if thier was a noticeable blem most of it is under the car.i received it and looked it over real good because i am fussy.if their was a blem on it i could not find it.i installed it and let me tell you it is a real pain in the drain.very hard to get at the screws on inside of the fender.you will see what i mean if you do it yourself.got some pics,but it is hard to see because it is a rainy cloudy day.the reflections you see in the diffuser are not scratches,but the carpet reflecting back.very happy with the part and the price.
will get more pics when i can pull it out.
took thes today.it was cloudy as usual.hard to see on a black car.
will get more pics when i can pull it out.
took thes today.it was cloudy as usual.hard to see on a black car.
Last edited by lordofwar; Oct 28, 2014 at 07:42 PM. Reason: new pics
Le Mans Master
Joined: Sep 2006
Posts: 9,602
Likes: 966
From: Palm Harbor not far from Sebring Florida
St. Jude Donor '11
Oldtimer
I heard they can be a PITA to install, but the finished product does look good. I am about to pull the trigger on the extended ZR1 style real spoiler.
Thanks for the post.
Thanks for the post.
Burning Brakes
Joined: Oct 2011
Posts: 915
Likes: 24
I bought this, and the zr1 extended rear spoiler.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
Le Mans Master
Joined: Sep 2006
Posts: 9,602
Likes: 966
From: Palm Harbor not far from Sebring Florida
St. Jude Donor '11
Oldtimer
I bought this, and the zr1 extended rear spoiler.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
Burning Brakes
Joined: Oct 2011
Posts: 915
Likes: 24
ultimately I am happy with it, it is a really good looking piece, and I am the only one that will ever really notice the over-hang. it was just a PITA to get it done properly and I would expect someone to be really on top of sending out replacement hardware if they screwed up and forgot to include it. I mean, I had my car all disassembled and holes drilled in my car just waiting for their hardware.. which still hasn't shown up lol.
Thread Starter
Safety Car
Joined: Nov 2011
Posts: 3,555
Likes: 637
tip
make sure you get the 7mm screws that hold the mudflap on.
took me a hour to remove the two top bracket bolts.had everting dicconnected and did not know about them.the bolts on top of the mufflers and the npp valves are in the way for a scocket and swivel.used a wench to turn them 1/4 turn at a time and they are long.the mudflaps are on with 2 way tape plus the bolt on the bottom.when trying to get then off cracked a thin locater tab on the flap.superglue fixed it.here are instructions for a diffrerent part but the dissembly is the same.
http://www.southerncarparts.com/Inst...n%20Manual.pdf
Last edited by lordofwar; Oct 17, 2014 at 06:10 PM.
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Instructor
Joined: Jun 2013
Posts: 159
Likes: 1
I bought this, and the zr1 extended rear spoiler.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
this diffuser fit perfect.
the spoiler did not. I had to sand down a lot of material to get the third brake light even close to fitting, and it would not fit properly when flush with the rear line of the rear bumper, you had to make the thing overhang about a quarter inch in order to make the rest of it come down enough to fit. I had my professional bodywork friend take a look at it and that was the only way we can make it fit. They also didn't include the hardware for the install, and its been almost two weeks and they still haven't sent it. Not impressed. Went and got my own.
Race Director
Joined: Aug 2008
Posts: 14,106
Likes: 1,608
From: Edmond Oklahoma
The first time I put a rear diffuser on I was ready to smash the whole thing. After doing several it takes me about 60 minutes now. There is a trick to aligning the tabs and the access to the 10mm screws on the sides can be challenging. I prefer to pull the muffler cans which will give you great access to everything. 
Does not look like a blem
Heel & Toe
Joined: Jul 2012
Posts: 18
Likes: 0
From: Eau Claire Wi
DSC_0736 by pachood, on Flickr(ran a super slow shutter to get any sort of picture out of this)
DSC_0722 by pachood, on FlickrI am very happy with all of the items I received. I bought: Front splitter, zr1 extended wing, diffuser and halo. So far I have only installed the splitter and wing.
Also, I dealt with C7 over email a ton, and they are really awesome folks. All said and done for all of the parts I really dont think I could go wrong. In the end I will probably blast the front splitter on a road course or autox. The other items are really nice and I feel even though they are blems they are 100% acceptable.
Last edited by pachood; Oct 29, 2014 at 08:48 PM.