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Discussion Starter #1
This is a how to on installing a CF Rear Varis STYLE diffuser. I'll make this as simple as possible but it's a lot of mounting and un-mounting, definitely a 2 person job.

Should take ~3 hours if you take your time ~5 hours. For this we took our time to make sure it's perfect.

Tools Required:
-Jack & 2 Stands
-Dremel
-10mm socket and ratchet, and cresent wrench (may vary this was the size of my hardware)
-14mm socket and ratchet (for sway bar)
-sharpie
-phillips and flat head screwdrivers (push pins)
-short phillips (for the screw push pins if you don't take your rear wheels off)
I used a vice grip and a phillips head off my electric screwdriver.
-removable locktite (optional)

1. Jack up the rear of the car carefully and make sure you left it in gear and ebrake pulled. Get it on some jack stands please

2. Start by mounting these brackets on the diffuser and tighten them enough so they won't spin.




3. Mount these brackets to the car. The long one will go on the sway bar and will face outwards to the tires.




4. The shorter brackets that look more like an "L" will go to the diffuser support tab that holds the diffuser to the bumper which is closes to the rear of the car. Mount the one to the tab then mount the other "L" looking bracket to the first one already mounted. Allow them to be loose enough to easily move up and down.




5. Now you're gonna want to test fit it so hold the bolts in the holes that are closer to the front of the car and push the bolts through the bracket mounted to the sway bar WHILE holding up the rear part to the plastic stock diffuser. If it mounts up fine and clears your exhaust and other parts you are good to skip to step 7.

6. Pull the diffuser off. Now for the cutting. Now you have a general idea of how it will mount and where to cut the CF diffuser. I will post pics of before the cut and through each cut. I used a dremel which worked wonders and was super easy to use. After that I used the sanding bit to clean it up and round out a hole. This was fun although scary... In the 3rd pic you will notice a sharpie line that was used for reference which can be cleaned off with rubbing alcohol if necessary. I also got a little extra sharpie on the OEM diffuser which came off with simply WINDEX <3








This one being the last one you can see how close I got to the support "beam" at the finished point. It look a good 6 times to make sure we got it right with the ETS v2 exhaust. It still barely touched the support beam if it did at all, but cleared the CF completely.


7. Now that it clears hold it up for a test fit again and mark with sharpie on the OEM diffuser where to drill. Take note in the difference of angle you are marking the sharpie as to the angle the bolt will be going in and adjust drilling accordingly. At this point you should also account for how the rear most brackets are angled on each other that way when you remove the diffuser you can easily torque it down to each other. Mine angled like so...


My markings looked as such.


 

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Discussion Starter #2 (Edited)
8. Remove the rear splash guards which I can post pics of later if necessary but it involves 2 10mm plastic bolts, 2 push pins, and two screw driver push pins (per side). DO NOT STRIP THE SCREW DRIVER PUSH PINS. A simple left turn 90* should do it otherwise you're doing something wrong and may strip it (push in hard and turn left watching to make sure it doesn't slip).

9. Drill the holes but make sure they aren't too big (washer needs to hold all bolts in anyways). Once they are drilled remove the brackets from the diffuser and transfer them onto the OEM diffuser this is hard and requires patience and small hands. I couldn't really do this but my buddy could. Mount the slanted "L" shaped bracket loosely to tighten it later but the rearmost one all the way (good luck with those ratchets and crescent wrenches in there....).



How my buddy got in there, hence to why you remove the rear splash guard.


10. Mount up the long slanted bracket from the sway bar to the diffuser and the rear most dual brackets. Tighten these down as if looking to finish (the diffuser should no longer have any play and should NOT move around).



11. Attach the bolts to the rearmost side bracket and tighten all the way.


12. You have two options with the final bracket.

Option 1 (recommended by me): Completely tighten all bolts to the diffuser. This will result in the OEM bending and you will not be able to return 2 push pins back into the rear splash guard (does not seem to affect the car). Note how the bolt is flush with both diffusers.


Option 2 fully tighten the bolt to the CF diffuser, re-install the splash gaurd, and then fully tighten the bolt on the OEM diffuser (harder and does not seem to fasten flush to the diffuser). Note how the top bolt is not flush with the OEM diffuser.


I did both options due to my buddy stripping the Screw push pins that I told you not to strip lol!!

I can take pics of both if requested.

ANNNNDDDDDD DONE!!!!








Let me know if I missed anything, I'll throw it in.
 

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Damn fine job! We've needed this post for YEARS! NOWHERE is there any info with this level of detail.

Out of curiosity, why did you mount the largest brackets facing outward instead of facing towards the rear? I had them facing towards the rear b/c I figured there would be less chance of the diffuser shifting if I bottomed out over something, etc. (Coincidentally, I ripped the whole thing off going over a raised manhole cover earlier this winter.)
 

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Discussion Starter #5
Day pics of the same angles.... Please...
I'll get more pics of the diffuser during the day up soon. I just took a few better pics of the brackets and one direct facing rear one lol

Damn fine job! We've needed this post for YEARS! NOWHERE is there any info with this level of detail.

Out of curiosity, why did you mouhttp://www.evoxforums.com/forums/showthread.php?p=5266265#post5266265nt the largest brackets facing outward instead of facing towards the rear? I had them facing towards the rear b/c I figured there would be less chance of the diffuser shifting if I bottomed out over something, etc. (Coincidentally, I ripped the whole thing off going over a raised manhole cover earlier this winter.)
As for you sir, thank you! Yeah I couldn't find any info on installing this even from rexpeed so I did my own (first time).

The only way the rear (longest slanted) brackets would match the holes was to put them facing the wheels. We spend a good 6 hours maybe more n the install mounting all the different brackets in different ways/locations till we finally got it right. After my cuts to make the exhaust fit in the exhaust still barely hits that support beam of plastic. Wasn't sure what to do there so I kinda just pulled the brackets down bending them and forcing the CF to slightly bend so it barely clears by a mm or 2.

We just did his APR front lip today too but a write up shouldn't be necessary but if requested I can do so but PITA on both projects for sure although the lip took ~2-3 hours.
 

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Discussion Starter #8
Very nice write up indeed. When did you get your diffuser? Did it have a trim/score line around where you had to trim. Varis now send these out like this now knowing we have to trim a bit to get her to fit.
No, this is a rep diffuser. I had my buddy hold up the diffuser while I drew lines in sharpie. The sharpie will come off with some rubbing alcohol, but try windex first. For ours, we cut out any sharpie marks when we sanded the cuts down with the dremel. The dremel made it look pretty damn clean, I tried to make it look good.
 

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A little late to this thread but where did you get your diffuser and do you know the brand? The one I’m looking at is a carbon creations one but does not come with brackets and hardware. Did yours come with hardware?
 

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A little late to this thread but where did you get your diffuser and do you know the brand? The one I’m looking at is a carbon creations one but does not come with brackets and hardware. Did yours come with hardware?
I'm on my second one and hardware wasnt complete so I scrapped all of it and just went to Home Depot. I ended up with some hinges and screws. I just went out to try to take some pics but they're rubbish so probably not that helpful. I screwed into the bottom of the plastic fins because i didnt like the way the brackets looked on the side of the fins. I seem to remember having a bolt in there somewhere too. I ended up supporting most of it by attaching hinges through one of the bolts that holds the sway bar brackets and then bolting it to the diffuser. It's a bit of a Frankenstein job, but is solidly on there with no rattles and has held strong for a at least 2+ years....
20200204_195719.jpg
20200204_195653.jpg
 

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I'm on my second one and hardware wasnt complete so I scrapped all of it and just went to Home Depot. I ended up with some hinges and screws. I just went out to try to take some pics but they're rubbish so probably not that helpful. I screwed into the bottom of the plastic fins because i didnt like the way the brackets looked on the side of the fins. I seem to remember having a bolt in there somewhere too. I ended up supporting most of it by attaching hinges through one of the bolts that holds the sway bar brackets and then bolting it to the diffuser. It's a bit of a Frankenstein job, but is solidly on there with no rattles and has held strong for a at least 2+ years.... View attachment 286405 View attachment 286406
Thanks, it looks like it held up good. I’ve thought about doing the same thing but a specific hardware kit would be ideal. I wonder where WhoDat got his diffuser or what brand it is, sounds like his hardware was included. I may even contact Varis and get a hardware kit from them.
 
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