Open Content Manager
Go to Content > Cars or Content > Tracks
Select the car or track you want to modify
Click Showroom or Open in Content folder
Locate the texture files in the car or track folder
Create or edit a skin folder if needed
Add your overlay texture as a PNG with transparency
Match the texture filename to the original texture name if replacing it
If using CSP custom shaders, place the texture in the correct extension or skin folder
Use the CSP Showroom to preview the result
Enable Custom Shaders Patch in Content Manager
Open the car or track in-game
Adjust texture placement in the skin or material settings if supported
Save the modified files
Reload the car or track to check the overlay
Repeat the process for any additional textures