Finally we are able to improve EA's WRC title - ReShade works again, as of 07-27-2025.
But, I had to disable cross-plattform play in the game preferences settings, so ReShade would load properly! ...will further investigate when I got some spare time.

This guide/mod does not work anymore, as of 07-19-2024 (version 1.9.0).

As EAs WRC neither runs on the latest Frostbite Engine nor the Unreal Engine 5 I tried my luck with ReShade to improve the visual quality overall.
This resulted in a 'Medium', 'High', 'Ultra', 'Ultra +, MRC' and new 'MRC'25' & 'NextGen' preset - so there should be at least one for everyone and it's absolutely free, too.
Btw the whole installation and setup process takes only up to 2 minutes.
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Performance-wise you'll need some more extra GPU performance - depending on your specs, ingame settings and prefered resolution. With that in mind the following numbers are just a rough estimate of the expected performance loss you will experience:
Med.: ~5%
High: ~10%
Ultra: ~15%
Ultra+: ~20%
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Micro-stuttering also went away for some after using reshade, but I cannot verify that.
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Anyway here's how WRC actually can look like, with some ReShade tweaks enabled:

To celebrate being able to use ReShade finally again, here is one updated and one new preset...

• NEW: MRC'25 & NextGen Presets
  zip-archive: https://workupload.com/start/QUUE5MxpH7v
  
  
• All-in-One Presets Package (incl. every preset)
  zip-archive: https://workupload.com/start/AwLQwtjpVHC

• Medium/High/Ultra/Ultra+ Presets (incl. their *Winter Editions*)
  zip-archive: https://workupload.com/start/y96Kk8jaJ2k
  
• More-Realistic-Colours (MRC) Preset (my preferred one in '23/'24)
  zip-archive: https://workupload.com/file/mfbTGnv9GeN

Extract the preferred, or simply all, *.ini files from the zip archive (ReShade_Presets_EA-WRC_v_02.zip) into your WRC directory under:
?:\SteamLibrary\steamapps\common\EA SPORTS WRC\WRC\Binaries\Win64\

Worries? ...dont worry! Just use https://www.virustotal.com/gui/home/upload to check the files. :)

1. Go to https://reshade.me/ and download the latest version (6.5.1).
2. Now execute and install the downloaded 'ReShade_Setup_6.X.X.exe'.
3. Follow the screenshots, if you're unsure on how to install ReShade properly.
3.1 Choose Game (WRC in this case) and choose DirectX 11 version
3.2 Skip the preset selection, afterwards select all Effect Packages
3.3 If you did everything correct, press finish.
(ReShade version 6.0.0 was released on January 14th 2024)

If ReShade is installed properly, you'll see a short notification at the top left of your screen every time you launch the game.
1. Ingame press 'HOME' / 'POS1' for enabling/disabling the ReShade Overlay
2. Do the short tutorial for ReShade, or
2.1 Skip the tutorial and set everything as shown in the following screenshot.
2.2 Optional: Enable (tick) 'Load only enabled effects', for faster loading times.
3. Finally you just need to choose a prefered preset and enable it.

I wanted to free up some space and deleted thousands of screenshots from my disk via the steam screenshot manager. But when you do that, steam will also delete all your screenshots you uploaded to he steam cloud (e.g. for a steam guide) as well - and without informing you about that. WTF Valve
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Here are some new comparison screenshots, also with the new two preset from 2025!
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'Vanilla'

'Medium' ReShade Preset

'High' ReShade Preset

'Ultra v2' ReShade Preset

'Ultra+' ReShade Preset

'MRC' ReShade Preset

'MRC'25' ReShade Preset

'NextGen' ReShade Preset

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'Vanilla'

'Medium' ReShade Preset

'High' ReShade Preset

'Ultra v2' ReShade Preset

'Ultra+' ReShade Preset

'MRC' ReShade Preset

'MRC'25' ReShade Preset

'NextGen' ReShade Preset

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'Vanilla'

'Medium' ReShade Preset

'High' ReShade Preset

'Ultra v2' ReShade Preset

'Ultra+' ReShade Preset

'MRC' ReShade Preset

'MRC'25' ReShade Preset

'NextGen' ReShade Preset

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'Vanilla'

'MRC'25' ReShade Preset

'NextGen' ReShade Preset

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'Vanilla'

'MRC'25' ReShade Preset

'NextGen' ReShade Preset

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Depending on your car model and if you drive in the cockpit view without the steering wheel visible and use the high/ultra v2/ultra+/MRC preset, you might get a blurry dashboard like seen on the left half in this screenshot:
(...this does not happen in the camera view with the steering wheel enabled, though.)
To fix this quick&dirty you need to disable Depth of Field 'Matso.DOF' from your preset:
*PS: Sometimes the bottom parts of the cutscenes are blurry too... (@high/ultra/MRC preset)