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      10-12-2022, 02:08 AM   #1
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DIY - E92 M3 Varis Style Diffuser Install - RW Carbon

DIY - E92 M3 Varis Style Diffuser Install - RW Carbon


Hello E9x M3'ers. I wanted to put together a comprehensive installation guide for the RW Carbon or similar Varis style full diffuser and under tray. To my knowledge and search, no one has personally documented their Varis or Varis style diffuser installs. Matt at RW Carbon asked that I help the community with a comprehensive DIY to install RW and other Varis style diffuser/under tray since the work is very intimidating for those who haven't done this type of install. Matt also asked that I push the speed threshold of this setup on the track in excess of 130mph, see if I can find any flaws with it at speeds.

I hope this DIY will help you guys and gals to be more comfortable to tackle this on your own. This DIY assumes you know how to jack a car up safely, have hex bits, socket set, vise (or a way to bend brackets), have an angled grinder or Dremel, and roll of 3M VHB tapes. Do this at your own risk as improper installation can cause damage to your diffuser, car, and cause safety concerns for others on the road driving behind you.

Main Reference:






Step 1: Prep the tray, use 5/16" drill bit to enlarge the holes of A, C, D, and E. For (B), use 3/8" drill bit to enlarge the holes by 1/4" each direction.

Step 2: Trim exhaust openings. After testing fitting with my OEM exhaust, I needed to cut 1/2" both sides of the exhaust openings. You can use an angled grinder or Dremel. Be sure to wear a mask.



Step 3: Prep hardware for (A) on the tray, using 2qty #1, 2qty #6 and 2qty #8. Note, I didn't use #8, I bought shorter M6 panhead bolts from the hardware (see below)





Step 4: Prep hardware for (F) on the tray, using 2qty #3, #9, #10, #14.



Step 5: Prep hardware for (B) and (C) on the tray, using 6qty #11, #13, 4qty short #7 for (C) and 2qty long #7 for (B).



Prepped tray:


Step 6: Prep vehicle for (A) (B) (C), remove OEM clip and replace with 8qty #6. Use flat head to assist.







Step 7: Secure bumper or heat shields to trim for (B) and (C). Once new clips are installed, use 6qty #8 or #9 to loosely align the bumper for (C) / heat shield for (B) to the plastic trims above it. Then use 6qty #15 (self tapping plastic screws) to secure the bumper / heat shield to the plastic liner above it so the holes won't move on you. Once all 6qty #15 are screwed on, remove the #8 and #9.



Step 8: Install brackets for (A). Use 2qt #2, #9, and #14 washers.



Step 9: Bend brackets for (E). Use 2qty #5 and bend exactly to how it is below. Pay attention to where the 2" are bent.





Step 10: Install brackets for (E). Use the OEM 8mm bolts, do not over tighten. Snug is fine. Add #6 clips to the brackets to secure the tray to it later.





Step 11: Bend bracket for longer point D. Pay close attention to the measurements below. Use 1qty #1, #4 and #6, assembly hardware for L brackets are #12 and #10.




Step 12: Assemble bracket for shorter point D. Use 2qty #1 and 1qty #6, assembly hardware for L brackets are #12 and #10.

Step 13: Mount both brackets for (D) to the chassis.



Step 14: Point (F) extra security. I bought 2qty M12 1.5 stainless steel bolts, large washers and drill a hole on the edge, and some springs to attach (F) to the steering arm bolts. You don't have to use springs, can use wire ties. I'm going to reach over 130mph often with this setup, so this is added security for my peace of mind.



Completed the mounting hardware:


Step 15: Prep the diffuser. Use a 5/16" drill bit to loosen up the 4 holes for easier install. Wipe down the mounting points on the diffuser and bumper with alcohol then install 3M VHB 1/2" tape.





Step 16: Install the diffuser, loosely bolt the diffuser (2 middle bolts are from reference point "A" and 2 outer are OEM 8mm bolts). Make sure it can sit flush, then remove the 3M tap then secure the diffuser with masking tape so it doesn't move. Tighten the 4 bolts holding the diffuser.

Step 17: Install the tray. Use 4qty #8 for (D) and (E) first. Note, one side of (E) may require drilling a new 5/16" hole if the bracket doesn't reach. Then tighten the rest of the bolts. For (A) assembly hardware for L brackets are #12 and #10, I use an angled needle nose to hold the nut while I bolt them down.







Extra security using springs for (F) (you can use wires instead)



I have EAS 80mm exhaust tips, which were riveted to the OEM modded muffler. I had a local shop fab 1.5" longer base for the tips to rivet to in order to extend the tips further back. Otherwise, the stock tips or non-adjustable tips will be too sunken in.



Enjoy. I've personally tested this tray to 135mph. Track season is at an end, will do more testing in the springs. Cheers.
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Last edited by Signature Wheel BMW; 10-12-2022 at 02:09 PM..
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      10-26-2022, 01:12 PM   #2
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Dat A$$

Still hanging on at 130mph+... cough, on the "track"

Checked all bolts, none were missing.

Update after 500mi: I will use 3M panel adhesive for the diffuser part to glue it to the bumper. 3M VHB ain't holding due to little touch points. Once 3M panel adhesive is applied, it's stuck to the bumper for life. The tray is fine with bolts, don't glue that part, lol.
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Last edited by Signature Wheel BMW; 10-27-2022 at 11:27 AM..
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      10-29-2022, 03:11 PM   #3
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Thank you very much bro
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e92 m3 diffuser, rw carbon, signature wheel, sv602, track e92m3, under tray, varis style diffuser

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